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정규식을 조금 더 쉽게 배울 수 있는 사이트 스탭별로 진행하다보면 정규식을 쉽게 습득할 수 있을 듯 하다. https://regexlearn.com Regex Learn - Step by step, from zero to advanced. Learn Regular Expressions, abbreviated as RegEx or RegExp, are a string of characters created within the framework of RegEx syntax rules. You can easily manage your data with RegEx, which uses commands like finding, matching, and editing. Regex can be used regexle..

https://www.phpliveregex.com/#tab-preg-match PHP Live Regex i case insensitive m treat as multi-line string s dot matches newline x ignore whitespace in regex A matches only at the start of string D matches only at the end of string U non-greedy matching by default www.phpliveregex.com