Regular Expressions

A regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids. You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager. The regex equivalent is .*\.txt

For more information on what are Regular Expressions(RE) and where to make use of them, please visit

http://www.codeproject.com/string/regex__.asp
http://www.regular-expressions.info/

RE are indeed a powerful tool that you can not live without. Give them a look today

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