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Example how to inverse match. Usable for postfix, when you need reject spoofing emails.

An extremely complete regex, that... Accepts international phones and most of regional phone numbers; Accepts phone numbers with/without "+", with/without space or "-" in the middle of the phone, and more. Gets groups of all important data of the phone number (local code, country code and the phone ...

search a WORD iff isn't between two apex. example: attribute="abc WORD abc" abc WORD, 'abc WORD "abc MATCHES: 2nd and 3th WORD

Change the tags only when they are within a tag.

Log: Bluecoat Event Type: Upstream Ref to Json: "Sources/Bluecoat/ipv4-2

Verify if the given text is a version tag, like git tags for versions in the git flow method

Get shortcode

This regex will match only filenames not containing the ".min" marker

Source: http://stackoverflow.com/questions/36777840/how-to-validate-phone-number-in-laravel-5-2 Thanks to: Nady Shalaby

This pattern finds comments block in the source code.