Change the tags only when they are within a tag.

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.

A solution for capture set/unset/catch a value of param query of URLs. Here is a example code that applies this pattern in JS, but JS doesn't have support to lookbehind.