Since version 3 (circa 2004), bash has a built-in regular expression comparison operator, represented by =~. A lot of scripting tricks that use grep or sed can now be handled by bash expressions ...

In this guide, you’ll learn common regex operators, how to use more advanced regex filters for SEO, how to use regex in Google Analytics and Google Search Console, and more.

When working with regular expressions in a shell script the norm is to use grep or sed or some other external command/program. Since version 3 of bash (released in 2004) there is another option: ...