I'm confused by Perl's regex abilities. There seems to be a lot of duplicate flags: ^ and \A both match the beginning of a string. $ and \Z both match the end. It seems redundant and confusing. I'm ...

Hi All I have a question concerning Perl's regular expression syntax:<BR><BR>I want to write a regular expression for a string like this<BR><pre class="ip-ubbcode ...

The final part of the report embarks on the issues of performance. Due to differences in the underlying algorithms which the regex engines are based on, a match in some languages may require greater ...

Imagine you are looking for a name in a telephone directory, but you can't remember its exact spelling. You can spend ages searching through all the possible combinations, unless you have a tool that ...