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. I want to replace 'text' with '345' but this becomes a backreference to (which doesn't exist) and then it prints the remaining '34'.[Editor's note: in this case it would be wise to rely on the preg_quote() function instead which was added for this specific purpose] If your replacement string has a dollar sign or a backslash. The function down below will return a string that escapes the backreferences.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.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.
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