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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?

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) 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.

It is not a bug per se, but can cause bugs if you don't know it's there.So if you have the string He said: "You're here"It would become: He said: \"You\'re here\"..be inserted into the expression.However, if you put this inside a set of single quotes, PHP will not strip away all the slashes correctly!A regular-expression that is ungreedy ("U", often does the job, but still: sometimes you just need a greedy regular expression working on long strings ...Since, an unhandled return-value of NULL usually creates a consecutive error in the application with unwanted and unforeseen consequences, I found the following solution to be quite helpful and at least save the application from crashing: You may or should also put a log-message or the sending of an email into the if-condition in order to get informed, once, one of your regular-expressions does not have the effect you desired it to have. Try preg_replace to only show alpha numeric characters$info = "The Development of code .To use backslash in replacement, it must be doubled ( PHP string).When working with a replacement pattern where a backreference is immediately followed by another number (i.e.: placing a literal number immediately after a matched pattern), you cannot use the familiar Because i search a lot 4 this: The following should be escaped if you are trying to match that character\ ^ . , Special Character Definitions\ Quote the next metacharacter^ Match the beginning of the line.You can even use your device camera to scan a document, whiteboard, or receipt and save it as a PDF.Adobe online services are available only to users 13 and older and require agreement to additional terms and the Adobe Privacy Policy.use "my_processing_function('\1')" or something similar as replacement expression, and do the fixing in that function).If you surrounded your backreference by single-quotes, the double-quotes are corrupt:$text = str_replace('\"', '"', $text); People using preg_replace with /e should at least be aware of this.

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