{"generatedAt":"2026-07-19T03:01:59.387Z","tool":{"id":"regex-tester","name":"Regex Tester","description":"Test and debug regular expressions with live matching, capture group extraction, plain-English explanations, and ReDoS vulnerability detection. Supports JavaScript, Python, and Go regex flavors.","category":"devtools","icon":".*","keywords":["regex","regular expression","test","match","pattern","replace","capture","group"],"hasApi":true,"remoteCallable":true,"remoteMode":"dedicated_api","riskClass":"H","maxInputBytes":524288,"timeoutMs":8000,"supportsStreaming":false,"url":"/regex-tester/","tags":["devtools"],"faqs":[{"question":"What is Regex Tester?","answer":"Regex Tester is a real-time regular expression testing tool with instant match highlighting and pattern explanation. It's essential for developers writing, debugging, or learning regex patterns."},{"question":"How do I use Regex Tester?","answer":"Enter your regex pattern in the top field and your test string below. Matches are highlighted in real time. You can set flags like global, case-insensitive, and multiline, and view captured groups for each match."},{"question":"Is Regex Tester free?","answer":"Yes. This tool is free to use with immediate access—no account required."},{"question":"Does Regex Tester store or send my data?","answer":"No. All processing happens entirely in your browser. Your data never leaves your device — nothing is sent to any server."},{"question":"What regex flavor does this tool support?","answer":"This tool uses JavaScript's native RegExp engine, which supports standard regex syntax including character classes, quantifiers, lookahead, lookbehind, named capture groups, and Unicode property escapes."}],"howTo":[{"title":"Enter your regex pattern","description":"Type a regular expression in the pattern field (e.g., `^[a-z0-9._%+-]+@[a-z0-9.-]+\\.[a-z]{2,}$` for email). Use flags (g, i, m) as needed."},{"title":"Input test strings to match against","description":"Paste or type multiple test strings in the input field. The tool will highlight all matches in real-time as you type."},{"title":"View matches and capture groups","description":"See all matches highlighted with their exact positions. If your pattern has capture groups (parentheses), see the captured values listed separately."},{"title":"Check regex explanation","description":"Read the auto-generated English explanation of what your regex does. This helps you debug patterns or learn regex syntax."},{"title":"Test edge cases and iterate","description":"Add more test strings to cover edge cases (empty strings, special chars, long text). Refine your pattern until all cases pass."}],"agentContract":{"toolId":"regex-tester","contractVersion":"2.0.0","remote_callable":true,"remote_mode":"dedicated_api","risk_class":"H","max_input_bytes":524288,"timeout_ms":8000,"supports_streaming":false,"preferred_surface":"dedicated_api","dedicated_api":{"baseUrl":"https://aidevhub.io/api/regex-tester/","openapiUrl":"https://aidevhub.io/api/openapi.yaml","endpoints":[{"method":"GET","path":"/api/regex-tester/","summary":"Test a regex pattern"},{"method":"POST","path":"/api/regex-tester/","summary":"Test a regex pattern"}],"riskClass":"H","inputMaxBytes":524288,"timeoutMs":8000},"runtime":{"endpoint":"/api/tools/run/","methods":["GET","POST"],"queryParams":[{"name":"toolId","required":true,"description":"Tool identifier"},{"name":"a","required":true,"description":"Primary input"}],"postBodyShape":{"toolId":"string","input":"{ a, b?, c?, mode? }"},"exampleGet":"https://aidevhub.io/api/tools/run/?toolId=regex-tester&a=...","policy":{"riskClass":"H","limit":10,"burst":5,"windowSec":60,"inputMaxBytes":524288,"timeoutMs":8000,"cacheTtlSec":0,"networkEnabled":false,"supportsStreaming":false}},"semantic_fields":{"pattern":"Field from Regex Tester API","text":"Field from Regex Tester API","flags":"Field from Regex Tester API"}},"relatedTools":[{"id":"glob-pattern-tester","name":"Glob Pattern Tester","url":"/glob-pattern-tester/","category":"devtools"},{"id":"cli-ux-linter","name":"CLI UX Linter","url":"/cli-ux-linter/","category":"devtools"},{"id":"ai-cli-generator","name":"AI CLI Generator","url":"/ai-cli-generator/","category":"devtools"},{"id":"csv-endpoint-builder","name":"CSV Endpoint Builder","url":"/csv-endpoint-builder/","category":"devtools"},{"id":"openprose-flow-linter","name":"OpenProse Flow Linter","url":"/openprose-flow-linter/","category":"devtools"},{"id":"trace-context-validator","name":"Trace Context Validator","url":"/trace-context-validator/","category":"devtools"}]}}