DEV.*Regex Tester

Regex Test: Match Highlighting + Replace Preview

Typical scenarios: ① validate a rule before using it; ② check user input formats (phone, email, etc.); ③ preview the result before a bulk replace.

How to use: enter the expression in the Regex box and paste the text to match in the Text box — all matches are highlighted in real time. Fill in a replacement to preview the result; common formats have one-click templates.

Notes: ① newlines are not matched by default — turn on the matching option to match across lines; ② test complex expressions step by step, adding conditions gradually to troubleshoot; ③ always check the preview before replacing to avoid unintended large-scale changes.