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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$ . But you can do much more with regular expressions. In a text editor like EditPad Pro or a specialized text processing tool like PowerGREP , you could use the regular expression \b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.
Regular-Expressions.info - Regex Tutorial, Examples and Reference - Regexp Patterns
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