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There seems to be some unexpected behavior when using the /m modifier when the line terminators are win32 or mac format. Try preg_replace (and other preg-functions) return null instead of a string when encountering problems you probably did not think about!If you have a string like below, and try to replace dots, the regex won't replace correctly: This 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). -------------------------It may not be obvious to everybody that the function returns NULL if an error of any kind occurres.Like the example from the manual for preg_replace:preg_replace("/()/e", "'\1'.strtoupper('\2').'\3'", $html_body); To make this easier, the data in a backreference with /e is run through addslashes() before being inserted in your replacement expression.So if you have the string He said: "You're here"It would become: He said: \"You\'re here\"..be inserted into the expression.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 : 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.
And in fact, if you have any dollar signs in your data, they would be interpreted as PHP variables. The 'solution' is to manually fix it in your expression.
Always do:"---------------------Heeeeeeeeeeeeeeeeeeeello Woooooooooooooooorld!!!!!!!!!!!!!!!!!!!!!!!! ===============================================================================================================~~~~~~~~~~~~~~~~ ~ ~ ~" I find it useful to output HTML form names to the user from time to time while going through the $_GET or $_POST on a user's submission and output keys of the GET or POST array...
the only problem being in the name attribute I follow common programming guidelines and have names like the following: event Date, event Time, user Email, etc.
Not great to just output to the user-- so I came up with this function.
It just adds a space before any uppercase letter in the 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.