Guide to regular expressions with examples
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The regular expression, or regexp, are the most powerful, versatile and hated tool used by programmers and system administrators.
They allow to express with a few characters search for strings, characters or words, and if done well can lead to good results, but if they are wrong they can not give you any useful result, and the worst thing is that often it is difficult to understand whether or not a regepx it is written with a correct syntax to cover all the possibility.
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