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Regex Explainer

Regex Explainer

Help & Examples

This enhanced Regex Explainer:

  • Groups logical tokens (e.g. non‑capturing vs. capturing groups).
  • Handles character classes as single units.
  • Explains quantifiers in context.
  • Still provides pattern stats and a cheat sheet.
Core Example

Input:

`^` → start‑of‑string anchor
`(?:https?)` → non‑capturing group matching “http” or “https”
`://` → literal “://”
`([\w\-.]+)` → capturing group: one or more word‑chars, hyphens, or dots (the domain)
`/?` → optional slash
`$` → end‑of‑string anchor
Pattern Statistics for Above
Length 23
Capturing Groups 1
Non‑capturing Groups 1
Positive Lookahead 0
Total Quantifiers 3
Quick‑Reference Cheat Sheet
`^` → start anchor | `$` → end anchor
`\d` → digit | `\w` → word char
`+` → one or more | `*` → zero or more
`?` → zero or one | `{n,m}` → range quantifier
`( )` → capturing | `(?: )` → non‑capturing
`(?= )` → lookahead | `(?<= )` → lookbehind
`|` → alternation | `.` → any char
When to Use

– Audit complex patterns at a glance.
– Document regex in code reviews.
– Teach teammates without regex experience.