The first method which comes to mind to do this is: [^(string)] but this of course won't work. use mysql_real_escape_string or pg_escape at least if you are not using prepared queries yet. We use Google Analytics and StatCounter for site usage analytics. Windows and PHP use the first slash as an escape character, so if you only use two slashes then it passes a UNC path with just one backslash. I have been working on a email system that will automatically generate a text email from a given HTML email by using strip_tags(). http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent, http://www.w3.org/TR/xhtml1/DTD/xhtml-symbol.ent, http://www.w3.org/TR/xhtml1/DTD/xhtml-special.ent, http://info.cern.ch/MarkUp/html-spec/html.dtd, Unicode.org - Proposal for Additional Deprecated Characters, UnicodeData.txt from the Unicode Consortium, Numerical Reference of Unicode code points, Webpage for encoding and decoding special characters, https://en.wikipedia.org/w/index.php?title=List_of_XML_and_HTML_character_entity_references&oldid=1126547794, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License 3.0, left-pointing double angle quotation mark, right-pointing double angle quotation mark, Cyrillic capital letter Byelorussian-Ukrainian I, Cyrillic small letter Byelorussian-Ukrainian i, ZeroWidthSpace, NegativeVeryThinSpace, NegativeThinSpace, NegativeMediumSpace, NegativeThickSpace, single left-pointing angle quotation mark, single right-pointing angle quotation mark, larr, leftarrow, LeftArrow, slarr, ShortLeftArrow, rarr, rightarrow, RightArrow, srarr, ShortRightArrow, darr, downarrow, DownArrow, ShortDownArrow, rlarr, rightleftarrows, RightArrowLeftArrow, upwards arrow leftwards of downwards arrow, lrarr, leftrightarrows, LeftArrowRightArrow, lrhar, ReverseEquilibrium, leftrightharpoons, leftwards harpoon over rightwards harpoon, rightwards harpoon over leftwards harpoon, rArr, Rightarrow, Implies, DoubleRightArrow, hArr, Leftrightarrow, DoubleLeftRightArrow, iff, rightwards squiggle arrow (rightwards zigzag arrow), downwards arrow leftwards of upwards arrow, setmn, setminus, Backslash, ssetmn, smallsetminus, prop, propto, Proportional, vprop, varpropto, par, parallel, DoubleVerticalBar, spar, shortparallel, npar, nparallel, NotDoubleVerticalBar, nspar, nshortparallel, awconint, CounterClockwiseContourIntegral, neither approximately nor actually equal to, asymp, ap, TildeTilde, approx, thkap, thickapprox, identical to; sometimes used for 'equivalent to' or 'congruent', not identical to; sometimes used for 'not congruent', double vertical bar double right turnstile, negated double vertical bar double right turnstile, rtrie, trianglerighteq, RightTriangleEqual, nltrie, ntrianglelefteq, NotLeftTriangleEqual, nrtrie, ntrianglerighteq, NotRightTriangleEqual, does not contain as normal subgroup or equal, element of with vertical bar at end of horizontal stroke, small element of with vertical bar at end of horizontal stroke, contains with vertical bar at end of horizontal stroke, small contains with vertical bar at end of horizontal stroke, upper left or lower right curly bracket section, upper right or lower left curly bracket section, bottom square bracket over top square bracket, box drawings light vertical and horizontal, box drawings down single and right double, box drawings down double and right single, box drawings vertical single and right double, box drawings vertical double and right single, box drawings vertical single and left double, box drawings vertical double and left single, box drawings down single and horizontal double, box drawings down double and horizontal single, box drawings up single and horizontal double, box drawings up double and horizontal single, box drawings vertical single and horizontal double, box drawings vertical double and horizontal single, box drawings double vertical and horizontal, squf, squarf, blacksquare, FilledVerySmallSquare, light left tortoise shell bracket ornament, light right tortoise shell bracket ornament, mathematical left white tortoise shell bracket, mathematical right white tortoise shell bracket, xharr, longleftrightarrow, LongLeftRightArrow, xlArr, Longleftarrow, DoubleLongLeftArrow, xrArr, Longrightarrow, DoubleLongRightArrow, xhArr, Longleftrightarrow, DoubleLongLeftRightArrow, leftwards double arrow with vertical stroke, rightwards double arrow with vertical stroke, left right double arrow with vertical stroke, leftwards arrow from bar to black diamond, rightwards arrow from bar to black diamond, arrow pointing rightwards then curving downwards, arrow pointing downwards then curving leftwards, arrow pointing downwards then curving rightwards, upwards two-headed arrow from small circle, downwards harpoon with barb right from bar, leftwards harpoon with barb down from bar, rightwards harpoon with barb down from bar, downwards harpoon with barb left from bar, leftwards harpoon with barb up above leftwards harpoon with barb down, upwards harpoon with barb left beside upwards harpoon with barb right, rightwards harpoon with barb up above rightwards harpoon with barb down, downwards harpoon with barb left beside downwards harpoon with barb right, leftwards harpoon with barb up above rightwards harpoon with barb up, leftwards harpoon with barb down above rightwards harpoon with barb down, rightwards harpoon with barb up above leftwards harpoon with barb up, rightwards harpoon with barb down above leftwards harpoon with barb down, leftwards harpoon with barb up above long dash, leftwards harpoon with barb down below long dash, rightwards harpoon with barb up above long dash, rightwards harpoon with barb down below long dash, upwards harpoon with barb left beside downwards harpoon with barb right, downwards harpoon with barb left beside upwards harpoon with barb right, left square bracket with tick in top corner, right square bracket with tick in bottom corner, left square bracket with tick in bottom corner, right square bracket with tick in top corner, measured angle with open arm ending in arrow pointing up and right, measured angle with open arm ending in arrow pointing up and left, measured angle with open arm ending in arrow pointing down and right, measured angle with open arm ending in arrow pointing down and left, measured angle with open arm ending in arrow pointing right and up, measured angle with open arm ending in arrow pointing left and up, measured angle with open arm ending in arrow pointing right and down, measured angle with open arm ending in arrow pointing left and down, circled anticlockwise-rotated division sign, circle with two horizontal strokes to the right, equals sign and slanted parallel with tilde above, identical to and slanted parallel ('equivalent to' and slanted parallel), line integration with rectangular path around pole, line integration with semicircular path around pole, circled multiplication sign with circumflex accent, intersection beside and joined with intersection, closed union with serifs and smash product, equals sign with two dots above and two dots below, less-than or slanted equal to with dot inside, greater-than or slanted equal to with dot inside, less-than or slanted equal to with dot above, greater-than or slanted equal to with dot above, less-than or slanted equal to with dot above right, greater-than or slanted equal to with dot above left, greater-than and single-line not equal to, less-than above double-line equal above greater-than, greater-than above double-line equal above less-than, less-than above similar above greater-than, greater-than above similar above less-than, less-than above greater-than above double-line equal, greater-than above less-than above double-line equal, less-than above slanted equal above greater-than above slanted equal, greater-than above slanted equal above less-than above slanted equal, slanted equal to or less-than with dot inside, slanted equal to or greater-than with dot inside, similar above less-than above equals sign, similar above greater-than above equals sign, less-than closed by curve above slanted equal, greater-than closed by curve above slanted equal, superset beside and joined by dash with subset, long dash from left member of double vertical, does not divide with reversed negation slash, less-than sign, combining long vertical line overlay, equals sign, combining reverse solidus overlay, greater-than sign, combining long vertical line overlay, latin small letter f, latin small letter j, rightwards wave arrow, combining long solidus overlay, partial differential, combining long solidus overlay, angle, combining long vertical line overlay, tilde operator, combining long vertical line overlay, inverted lazy s, combining double low line, minus tilde, combining long solidus overlay, triple tilde, combining long solidus overlay, equivalent to, combining long vertical line overlay, geometrically equivalent to, combining long solidus overlay, difference between, combining long solidus overlay, approaches the limit, combining long solidus overlay, identical to, combining reverse solidus overlay, less-than or equal to, combining long vertical line overlay, greater-than or equal to, combining long vertical line overlay, less-than over equal to, combining long solidus overlay, greater-than over equal to, combining long solidus overlay, less-than but not equal to, variation selector-1, greater-than but not equal to, variation selector-1, much less-than, combining long solidus overlay, much less-than, combining long vertical line overlay, much greater-than, combining long solidus overlay, much greater-than, combining long vertical line overlay, succeeds or equivalent to, combining long solidus overlay, subset of, combining long vertical line overlay, superset of, combining long vertical line overlay, subset of with not equal to, variation selector-1, superset of with not equal to, variation selector-1, square image of, combining long solidus overlay, square original of, combining long solidus overlay, normal subgroup of or equal to, combining long vertical line overlay, contains as normal subgroup or equal to, combining long vertical line overlay, very much less-than, combining long solidus overlay, very much greater-than, combining long solidus overlay, less-than equal to or greater-than, variation selector-1, greater-than equal to or less-than, variation selector-1, element of with dot above, combining long solidus overlay, element of with two horizontal strokes, combining long solidus overlay, wave arrow pointing directly right, combining long solidus overlay, left triangle beside vertical bar, combining long solidus overlay, vertical bar beside right triangle, combining long solidus overlay, congruent with dot above, combining long solidus overlay, approximately equal or equal to, combining long solidus overlay, less-than or slanted equal to, combining long solidus overlay, greater-than or slanted equal to, combining long solidus overlay, double nested less-than, combining long solidus overlay, double nested greater-than, combining long solidus overlay, smaller than or equal to, variation selector-1, larger than or equal to, variation selector-1, precedes above single-line equals sign, combining long solidus overlay, succeeds above single-line equals sign, combining long solidus overlay, subset of above equals sign, combining long solidus overlay, superset of above equals sign, combining long solidus overlay, subset of above not equal to, variation selector-1, superset of above not equal to, variation selector-1, double solidus operator, combining reverse solidus overlay, HTML 5.0: rdquor and CloseCurlyDoubleQuote, HTML 5.0: leftarrow, LeftArrow, slarr, and ShortLeftArrow, HTML 5.0: uparrow, UpArrow, and ShortUpArrow, HTML 5.0: rightarrow, RightArrow, srarr, and ShortRightArrow, HTML 5.0: downarrow, DownArrow, and ShortDownArrow, HTML 5.0: leftrightarrow and LeftRightArrow, HTML 5.0: Rightarrow, Implies, and DoubleRightArrow, HTML 5.0: Leftrightarrow, DoubleLeftRightArrow, and iff, HTML 5.0: emptyset, emptyv, and varnothing, HTML 5.0: niv, ReverseElement, and SuchThat, HTML 5.0: propto, Proportional, vprop, and varpropto, HTML 5.0: ap, TildeTilde, approx, thkap, and thickapprox, The original HTML 1.0 DTD, which would have been available at, If the document is read by a conforming HTML processor, then only the 252 HTML character entities can safely be used. An example of an illegal character is a double quote inside a string that is surrounded by double quotes: To validate directorys on Windows i used this: Attention! See this list of special character used in JSON : \b Backspace (ascii code 08) \f Form feed (ascii code 0C) \n New line \r Carriage return \t Tab \" Double quote \\ Backslash character A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form. You can create a string in PHP by enclosing a sequence of characters in either single or double quotes. said the old guru, Procedural style only: A mysqli object However, the advent of Unicode has largely superseded them. Sort all words in a string alphabetically. Quickly remove dots, commas, and other marks from a string. encoding. I noticed that in order to deal with UTF-8 texts, without having to recompile php with the PCRE UTF-8 flag enabled, you can just add the following sequence at the start of your pattern: (*UTF8). The " entity was omitted from the HTML 3.2 specification. Here is a function that does it: I think two additional characters need to be removed or escaped to protect from injection: ` (accent grave) and ; (semicolon). So the best way is to add the u option (for unicode) after the delimiters. Reverse the order of all words in a string. I spent a while replacing all my ereg() calls to preg_match(), since ereg() is now deprecated and will not be supported as of v 6.0. Quickly convert a sequence of bytes to a string. There does not seem to be any mention of the PHP version of switches that can be used with regular expressions. !~*\()\[\] ])|(? The format is the same as for any entity reference: where name is the case-sensitive name of the entity. -]?(\d{4})(? Quickly create a palindrome from a string. it's very basic, and allows you to try different patterns and combinations. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: &#nnnn; or &#xhhhh;. : (?i:ext)\.? Note: On 32-bit builds, a string can be as large as up to 2GB (2147483647 bytes maximum) Simple function to return a sub-string following the preg convention. The "Unicode code point" column cites the character via standard UCS/Unicode "U+" notation, which shows the character's code point in hexadecimal. Basic test for invalid UTF-8 that can hi-jack IE: '@[^\x9\xA\xD\x20-\x{D7FF}\x{E000}-\x{FFFD}\x{10000}-\x{10FFFF}]@u', Human Language and Character Encoding Support, http://www.php.net/manual/en/regexp.reference.subpatterns.php, http://fr.php.net/manual/en/function.filter-var.php, http://www.regular-expressions.info/named.html, http://www.php.net/manual/en/function.filter-var.php, http://www.php.net/manual/en/pcre.configuration.php, http://www.php.net/manual/en/function.preg-last-error.php, http://api.drupal.org/api/drupal/includes--bootstrap.inc/function/drupal_validate_utf8/7, http://www.w3.org/TR/2000/REC-xml-20001006#charsets. This sample is for checking persian character: '/^(?P[^;*][^;]*){1}(?:;q=(?P[0-9.]+))?$/u'. The real_escape_string() / mysqli_real_escape_string() function escapes special characters in a string for use in an SQL query, taking into account the current character set of the connection. (), offsetpreg_match() Quickly truncate a string to the given length. It is a charset problem, use utf8_decode/decode to fix. Run a spell checker and find mistakes in a string. Its quite generous in what it will allow. Note that the like operator requires an *additional* level of escaping for its special characters, *on top of* that performed by mysql_escape_string. Every word in this sentence is separated by a tab. My solution was to base64_encode() the string, put that in the hidden form field, If PREG_OFFSET_CAPTURE is set then unmatched captures (i.e. Quickly extract string data from a JSON data structure. Find and extract all email addresses from a string. Quickly convert a hexadecimal string to a string. If you want to validate an email in one line, use filter_var() function ! Create a string that doesn't have too many characters. Quickly convert a string to base64 encoding. strpos() , "PHPisthewebscriptinglanguageofchoice. Characters encoded are NUL (ASCII 0), \n, \r, \, ', ", and When trying to match accented characters, such as those found in Spanish, there seems to be a different internal interpretation when using character classes. This page was last edited on 25 June 2022, at 14:39. PHP 5.4 - Changed the [1] The HTML 5 specification requires the use of the standard DTDs and does not allow users to define additional entities. La cadena de entrada. string. // will be true if characters arnt 0-9, A-Z or a-z. When escaping, be sure to use single quotes to prevent characters like \n from becoming newlines. glob's regex also supports character classes and negative character classes, using the syntax [] and [^]. returned by mysqli_connect() or mysqli_init(). ? , () string. Required. "Quoting strings is tricky," pattern^ $ Quickly rotate a string to the left or to the right. Every\tword\tin\tthis\tsentence\tis\tsepargated\tby\ta\ttab. Method 1. Quickly convert a string to a JSON string. Rearrange letters in a string and create a new string. I recently encountered a problem trying to capture multiple instances of named subpatterns from filenames. There is no server-side processing at all. By using Online String Tools you agree to our. The trailing semicolon may be omitted for this named entity. Chapter 3. Sort a string that contains only numbers. Quickly check if a string matches a regular expression. Control-Z. Add a comment | Note that you should escape any other characters, as any which currently have a special meaning will produce undesirable results, and other characters may be assigned meaning in future PHP versions. Convert quoted-printable encoded data to a string. PHP 5.3.7 - Added $2x$ and $2y$ Blowfish modes. The string or an array with strings to search and replace. Quickly convert a CSV file to evenly aligned columns of space-separated strings. string text = "abc aabbcc"; string searchStr = "aa"; int count = text.Split(new[] {searchStr}, StringSplitOptions.None).Length - 1; Method 2. According to an often overlooked note at the bottom of: If you wonder why (besides \, ' and ") NUL (ASCII 0), \n, \r, and Control-Z are escaped: it is not to prevent sql injection, but to prevent your sql logfile to get unreadable. Make a string go in a square or a rectangle. It is interpreted as a UTF-8 character whose code number is the given hexadecimal number. Note: Usually an enclosure character is escaped inside a field by doubling it; however, the escape character can be used as an alternative. Escapes special characters in the unescaped_string, taking into account the current character set of the connection so that it is safe to place it in a mysql_query().If binary data is to be inserted, this function must be used. An escape character is a backslash \ followed by the character you want to insert. PREG_OFFSET_CAPTURE not UTF-8 aware when using u modifier, Because making a truly correct email validation function is harder than one may think, consider using this one which comes with PHP through the filter_var function (. Quickly convert spaces to newlines in a string. Parmetros. If offset is negative, the returned string will start at the offset'th character from the end of string. '~[\x00\x0A\x0D\x1A\x22\x25\x27\x5C\x5F]~u'. *expression\([^>]*>#iU", "#(<[^>]+)style=([\`\'\"]*). YAML is both a text format and a method for presenting any native data structure in this format. Quickly convert tabs to spaces in a string. Quickly extract all string data from a BBCode markup. The semicolon is required, unless marked otherwise in the table below (see [a]). To render the character, the format &name; is used; for example, & renders as &. the /'s are now required. *behaviour\([^>]*>#iU", "#]*>#i", Workaround for getting the offset in UTF-8. Split a string into fragments and extract the beginning parts. This example adds backslashes before quotes and newlines. Quickly convert a string to an octal string. preg match, '/(base64_|eval|system|shell_|exec|php_)/i', "#(<[^>]+)style=([\`\'\"]*). *(),;?&=\$_.-]+), "(\?[a-z+&\$_.-][a-z0-9;:@&%=+\/\$_.-]*)?". matches The "Standard" column indicates the first version of XML that includes the entity. In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text. This is presumably because there is no offset, and thus the original PHP dev decided best to just leave it out. Quickly sort a list of strings in alphabetical, alphanumerical or numerical order. These functions represent alternatives to mysqli::real_escape_string, as long as your DB connection and Multibyte extension are using the same character set (UTF-8), they will produce the same results by escaping the same characters as mysqli::real_escape_string. Your IP address is saved on our web server, but it's not associated with any personally identifiable information. Quickly convert newlines to spaces in a string. These (with the exception of the ' entity) have the same names and represent the same characters as the 252 character entities in HTML. This function is used to create a legal SQL string that can be used in an SQL statement. as literal string, we have to escape them. Quickly decode a netstring and output its contents. Quickly randomize the case of each letter in a string. Quickly convert a string to a decimal string. In this particular example, the slice statement [::-1] means start at the end of the string and end at position 0, move with the step -1, negative one, which means one step backwards. Because in the other cases, you would need to do a foreach for each word. If subject is an array, then the search and replace is performed on every entry Processes and Models. false false An example of an illegal character is a double quote inside a string that is surrounded by double quotes: You will get an error if you use double quotes inside a string that is //Pattern could easily be done somewhere else if words are static. Always use ` (accent grave) to surround table, key, and column names, and always use ' (apostrophe) to surround column values in SQL statements, especially if the names or values can ever contain spaces. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. $matches[0] $matches[1] Characters encoded are NUL (ASCII 0), \n, \r, \, ', ", and Control-Z. :(Now, a little non-smart but maybe more accurate code is below function. matches Remove all diacritical signs from a string. The character set must be set either at the server level, or with An empty string ("") disables the proprietary escape mechanism. Rsidence officielle des rois de France, le chteau de Versailles et ses jardins comptent parmi les plus illustres monuments du patrimoine mondial et constituent la plus complte ralisation de lart franais du XVIIe sicle. subject, offset stored as 0x5C,0x27 (escaped apostrophe), this only matches apostrophe, //matches, stored as 0x5C,0x5C,0x27 (escaped backslash and unescaped apostrophe), //also matches, stored as 0x5C,0x5C,0x5C,0x27 (escaped backslash and escaped apostrophe), //same match - 3 backslashes are interpreted as 2 in PHP, if the following character is not escapeable, Just an interesting note. (?<=x) , substr() \G ^ A offset , pattern subject Quickly convert strings to a proper CSV file. See the concepts section With efficient programming, the foreach is ONLY faster when the first word in the ban-list is found. Quickly generate a string from the given regular expression. I tested only with ISO-2022-JP, only in costomized phpBB2.0.5, only some cases. (\d{1,5}))?$/', // or, provided you use the $matches argument in preg_match. The normative reference to RFC 2070 (still found in DTDs defining the character entities for HTML or XHTML) is historic; this RFC (along with other RFC's related to different part of the HTML specification) has been deprecated in favor of the newer informational RFC 2854 which defines the "text/html" MIME type and references directly the W3C specifications for the actual HTML content. Specifies the MySQL connection to use. The original hexadecimal escape sequence, \xhh, matches a two-byte UTF-8 character if the value is greater than 127. Use string.Split() method to split string by multiple characters separators, and count the length of returned array. '/(?P\w+)($|\((?P(\d+|(.*)))\))/'. Live news, investigations, opinion, photos and video by the journalists of The New York Times from more than 150 countries around the world. Mathias Bynens", "How Bob Bemer Invented the ESCAPE Sequence and Key", That Powerful ESCAPE Character -- Key and Sequences, https://en.wikipedia.org/w/index.php?title=Escape_character&oldid=1094951589, Short description is different from Wikidata, Articles needing additional references from April 2010, All articles needing additional references, Wikipedia articles incorporating text from the Federal Standard 1037C, Creative Commons Attribution-ShareAlike License 3.0. Generally, a download manager enables downloading of large files or multiples files in one session. The x must be lowercase in XML documents. Return Value: Returns the converted string. Shift characters in a string to the left or right. The function will return false and raise a warning if the input $subject is too long : Preg_match returns empty result trying to validate $subject with carriege returns (/n/r). , preg_match() ISO proposed: these characters have been standardized in ISO 10646 after the release of HTML 4.0. The HTML 5 DTDs define many named entities, references to which act as mnemonic aliases for certain Unicode characters. Assume we have the following code: After the breaking change in 7.4, be aware that count( $matches ) may be different, depending on PREG_UNMATCHED_AS_NULL flag. This tool implements PHP's addslashes function in JavaScript. Assume we have the following code: Get certifiedby completinga course today! Although it is known as URL encoding, it is also used more generally within the main Uniform Resource Identifier (URI) set, which includes both Uniform Resource Locator (URL) and Quickly filter lines that match a pattern in a multi-line string. mysqli::real_escape_string -- mysqli_real_escape_string Escapes special characters in a string for use in an SQL statement, taking into account the current charset of the connection. Quickly convert a string to HTML entities. This function is used to create a legal SQL string that you can use in an To extract scheme, host, path, ect. While using W3Schools, you agree to have read and accepted our, Required. Escape Characters. In this particular example, the slice statement [::-1] means start at the end of the string and end at position 0, move with the step -1, negative one, which means one step backwards. Find how many words there are in a string. Count the occurrences of multiple characters within a string in C#. Put digits in place of characters in a string. Output: "Geksforg" "Geksforg Iaticmpun" Approach 2: In this method, we use the set data structure.The set data structure contains only unique values, and we take the advantage of it. Load a string, slash-escape a string. ", W3Schools is optimized for learning and training. ASCII escape character. Feb 15 at 16:06. Look at example of procedural style at the bottom. keep in mind that single quote is not the only special character that can break your sql query. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. When you use preg_match() for security purpose or huge data processing. taking into account the current character set of the connection. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: txt = "We are the so-called "Vikings" from the north. As I wasted lots of time finding a REAL regex for URLs and resulted in building it on my own, I now have found one, that seems to work for all kinds of urls: "([a-z0-9+!*(),;?&=\$_.-]+(\:[a-z0-9+! Convert an Xxencoded string to a regular string. List of XML and HTML character entity references, Standard public entity sets for characters, List of character entity references in HTML, Entities representing special characters in XHTML. Examples might be simplified to improve reading and learning. so if you try to use move_uploaded_file() function as in example to allow for users to upload files, you must check if this file contains a bad codes or not so we use this function. U+22D8 does not have the lll entity in the HTML 5.2 list, but was erroneously omitted from the list. For instance. ? So to extract the unique values from string using Set we follow the steps below.. Convert a string to quoted-printable encoding. Split a string into chunks of certain length. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. 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