https://timely-sprinkles-c55fc0.netlify.app/tags/regular-expression/ Recent content in Regular Expression on Changlin's Blog Hugo -- gohugo.io en-us Mon, 18 Dec 2023 19:33:06 -0600 https://timely-sprinkles-c55fc0.netlify.app/posts/regex/ Mon, 18 Dec 2023 19:33:06 -0600 https://timely-sprinkles-c55fc0.netlify.app/posts/regex/ Regular Expression A regular expression (shortened as regex or regexp), sometimes referred to as rational expression, is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for “find” or “find and replace” operations on strings, or for input validation. Basic rule for Regex Quantifier(限定符):only for one character ?: means the character show up before ? once or zero, for example: