Regular expressions are very powerful if you have to find some text.  See below for links to pages where regular expressions are explained in detail and where you can text them very quickly.


Tutorials (English):

Regular expressions info Very detailed information and tutorial about regex

Microsoft: Regular expression language - Quicke reference

Opengroup: Regular expressions


Useful online tools to test regular expressions

Regexr Very powerful online regex test tool
Regular expression calculator Another online regex test tool
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