O’Reilly book “Mastering Regular Expressions” by Jeffrey Friedl

the O’Reilly book “Mastering Regular Expressions” by Jeffrey Friedl is fantastic.In practice, however, you don’t need to be an expert on regular expressions, as you really only need to know how to capture simple patterns. In fact, complex regexes can have poor lookup performance, so you probably shouldn’t rely on the full power of regexes.