Web appIn ProgressPublished: April 30, 2026

Regex Sandbox

An interactive playground for building and testing regular expressions with live match highlighting.

Open toolSource code

Tech stack

AstroTypeScript

What it does

Regex Sandbox lets you write a pattern, paste sample text, and see matches and capture groups highlighted in real time — with a plain-language explanation of what each part of the pattern does.

In progress

  • Live match highlighting
  • Capture group inspector
  • Pattern explainer
  • Shareable permalinks

Status

Under active development — the core matcher works; the explainer and sharing are next.

Knowledge base

Guides and notes related to this entry.

2 articles

  • Knowledge base

    Pattern explainer preview

    Coming soon

    The explainer will translate tokens like \d+ into plain language beside the pattern.

    Until then this stub article fills the modal so layout and scrolling can be checked.

  • Knowledge base

    Shareable permalinks (planned)

    URL shape

    Patterns will be encoded into the query string so a link restores the sandbox state.

    Security note: never put secrets in share URLs. Stub content only.

Tags:regexdeveloper-tools