Web, domains and email
regex
In short and in plain language
A regex is a search pattern for text.
It does not just look for one fixed word. It looks for rules. So it can find a name in several spellings, for example.
The rules differ a little from tool to tool.
Definition
Regex is short for regular expression, a search pattern that searches text by rules rather than fixed words. It can be used, for example, to filter search queries that contain a brand name in different spellings. The exact syntax differs slightly between tools.