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Match 1 or 0 times Match exactly n times Match at least n times Match at least n but not more than m times More Special Character Stuff\t tab (HT, TAB)\n newline (LF, NL)\r return (CR)\f form feed (FF)\a alarm (bell) (BEL)\e escape (think troff) (ESC)3 octal char (think of a PDP-11)\x1B hex char\c[ control char\l lowercase next char (think vi)\u uppercase next char (think vi)\L lowercase till \E (think vi)\U uppercase till \E (think vi)\E end case modification (think vi)\Q quote (disable) pattern metacharacters till \EEven More Special Characters\w Match a "word" character (alphanumeric plus "_")\W Match a non-word character\s Match a whitespace character\S Match a non-whitespace character\d Match a digit character\D Match a non-digit character\b Match a word boundary\B Match a non-(word boundary)\A Match only at beginning of string\Z Match only at end of string, or before newline at the end\z Match only at end of string\G Match only where previous m//g left off (works only with /g) If you want to catch characters, as well european, russian, chinese, japanese, korean of whatever, just :- use mb_internal_encoding('UTF-8');- use preg_replace('`...`u', '...', $string) with the u (unicode) modifier For further information, the complete list of preg_* modifiers could be found at : code must convert numeric html entities to utf8. It treats wrong codes starting with The reason is that code2utf will be called with leading zero, exactly what the pattern matches - code2utf(039). If your buffer is larger than this, look to increase these two values.
There seems to be some unexpected behavior when using the /m modifier when the line terminators are win32 or mac format.
Match any character (except newline)$ Match the end of the line (or before newline at the end)| Alternation() Grouping Character class* Match 0 or more times Match 1 or more times? Try If you have issues where preg_replace returns an empty string, please take a look at these two ini parameters:pcre.backtrack_limitpcre.recursion_limit The default is set to 100K.
, Special Character Definitions\ Quote the next metacharacter^ Match the beginning of the line.
It just adds a space before any uppercase letter in the string.
Be aware that when using the "/u" modifier, if your input text contains any bad UTF-8 code sequences, then preg_replace will return an empty string, regardless of whether there were any matches.
Hello there, I would like to share a regex (PHP) sniplet of code I wrote (2012) for myself it is also being used in the Yerico sriptmerge plugin for joomla marked as simple code..
So if you have the string He said: "You're here"It would become: He said: \"You\'re here\"..be inserted into the expression.With /e, the replacement string is a PHP expression.So when you use a backreference in the replacement expression, you need to put the backreference inside quotes, or otherwise it would be interpreted as PHP code.However, if you put this inside a set of single quotes, PHP will not strip away all the slashes correctly!
Try this: print ' He said: \"You\'re here\" '; Output: He said: \"You're here\"This is because the sequence \" inside single quotes is not recognized as anything special, and it is output literally.So i knocked up this simple little preg_replace to use the query string set by IIS when redirecting to a PHP error page.People using the /e modifier with preg_replace should be aware of the following weird behaviour.It is easiest to use a separate processing function, and do the replacing there (i.e.