# apphelp tool profile
name: Regex Tester
tool: tool-regextester
domain: regextester.apphelp.net
canonical: https://regextester.apphelp.net/en
summary: Test JavaScript regular expressions against sample text locally in the browser.
inputs: A regex pattern, flags, a test string, and an optional replacement template.
outputs: A list of matches with index ranges and capture groups, or the replaced string.
use-cases: build and debug regex patterns; inspect capture groups; preview find-and-replace; validate input formats
keywords: regex tester, regular expression tester, regex match, regex replace, javascript regex tool
languages: en, zh-CN, zh-TW, ar, de, fr
seo: locale-routed, canonical, hreflang, sitemap, robots, JSON-LD
geo: llm.txt profile, concise task summary, input/output contract, use-case list, local-first privacy notes
privacy: browser-local processing, no upload by default
analytics: Microsoft Clarity and Google Analytics (opt-in)
no-login: true