Regex Visualizer

regex101 is dense and intimidating. Debuggex is half-abandoned. This one parses your pattern, draws it as a railroad diagram (boxes, branches, loops), and explains every piece in plain English next to it. Live tester with match highlighting and capture groups.

What this tool does

• Railroad diagram: sequences, alternations, quantifiers, groups, lookaround
• Plain-English explanation of every node, indented to match the structure
• Live tester: paste sample text, see all matches highlighted
• Capture group breakdown per match (numbered and named)
• Flag toggles (g/i/m/s/u/y), shareable URL

regex regular expression developer tools debugging pattern matching

About Help Toolz

Help Toolz is a collection of free browser tools that solve real problems without signup walls, ad-stuffed listicles, or affiliate-link articles. Every tool runs entirely in your browser — your inputs never leave your device.

Learn more about the project · Privacy policy · Terms of service · Contact

Other tools you might find useful

• World Clock — See what time it is in cities you care about.
• Timezone Overlap Finder — Find meeting times that work for everyone.
• Cron Job Editor — Plain English to cron expression.
• Palette Checker — WCAG contrast and colorblindness for the whole palette.
• Citation Converter — Reformat a bibliography between citation styles.
• Unit Converter — Engineering unit converter for the edge cases.
• Contract Rate Calculator — Salary to hourly contractor rate, with the math nobody else does.
• Heat Pump Sizing Calculator — Size a heat pump and estimate IRA tax credits. US homes.
• Carbon Offset Cost Calculator — Compare offset types by quality, permanence, and price.
• AWS Cost Calculator — Estimate AWS bills by workload pattern, not service-by-service.
• FDA 510(k) Predicate Finder — Search the FDA cleared-device database and compare predicates.
• Startup Cost Calculator — How much it actually costs to start a small business by state and industry.