What it does
Regexper turns an expression into a visual diagram with SVG and PNG download options and a permalink.
Enter an expression, choose Display and read its railroad diagram from left to right. Branches show alternatives; loops show optional or repeated sections, with capture groups and character sets labeled. This helps explain a pattern's structure in a review note. Download the diagram as SVG or PNG, or use the permalink. A diagram explains the paths through the expression; use a sample-text matcher as well when checking the actual strings accepted by the destination engine.
Strengths
- SVG and PNG diagram exports
- Shareable permalink
Best for
- Explaining a regular expression visually
Sources
- Regexper (Oct 26, 2026)
- Regexper railroad diagram interpretation (Oct 26, 2026)