from the PHP UK list, Keith Young
When using PCRE (Perl Compatible Regular Expressions) you need to surround the expression to be evaluated with a delimiter.
The above are all equivalent… Most people use // as the delimiters.
There is one more “problem” in the PCRE you wrote. The “.” in a PCRE denotes ANY character. So if you had “wwwx” it would match. To force the “.” to evaulate as a period you need to escape it:
More information about PCRE and how to use it (in PHP) is available on the PHP website (I find the pattern syntax page to be the one I reference more often – link below):
One last point. If you are doing a straight replace that doesn’t require any level of complexity to the pattern matching, then as someone else suggested, using str_replace is a better solution, since it is much easier on the PHP engine. This is more noticable in situations where the replacement will occur multiple times (like in
loops and such).