A regular expression is a special text string for describing a search pattern, you can think of regular expressions as wildcards.
You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager, the regex equivalent is .*\.txt
They are used on many development language such as PHP, Perl, Java and also .NET
Sometimes you need to create/modify them, a quick way to test it is to use this online service:
REGex TESTER.
For more information about Regular Expression see these links:
http://en.wikipedia.org/wiki/Regular_expression
http://www.regular-expressions.info
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