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regular expressions swift performance quick links changelog landing regular expressions knowledgebase tweaks regular expressions in swift performance you can apply regex in different places mostly to exclude urls of parts from caching what is regex regular expressions a regular expression 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 a z 2 6 b to search for an email address any email address to be exact a very similar regular expression can be used by a programmer to check if the user entered a properly formatted email address in just one line of code whether that code is written in perl php java a net language or a multitude of other languages since regular expressions is a mouthful you will usually find the term abbreviated as regex or regexp we prefer regex since it can be easily pluralized as regexes since php 7 3 you need to escape hyphen as well product item here you can test if your regex is valid example 1 exclude all multilingual contact pages such as contact contact us contactos kontakt regex onta t example 2 for images image example 3 exclude all pages urls which contain https www yourdomain com product offers product offers example 4 target all store something urls but not store itself store example 5 all pages except homepage example 6 for date archives d 4 d 2 d 2 example 7 for tags tag did you like this article search tweaks constants redirect based on browser language categories getting started general optimization caching media cdn compatibility tweaks license filters faq changelog 2026 swift performance all rights reserved made with fevr