Juicy Regex Builder

v1.0.3

Blocks

Options

Actions

Tip

Hover an icon to see its description and effect preview.

Rules

Contains

Compiled Pattern

/(?=.*hello)[\s\S]+/u

Explanation

Must contain “hello”.

Live Preview

Type test text on the left; matches highlighted on the right.

Test input

Preview

hey hello (try turning on /g to see multi-match behavior)

Matches

Full list with indices and named groups (if present).

#	Index	Match
1	0	hey hello (try turning on /g to see multi-match behavior)

By default we return a single whole-string match (global g is off). Turn on g to see multiple matches. The builder composes constraints with lookaheads and keeps the body greedy to avoid per-character matches.

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Coding

About Regex Builder

Construct and test regular expressions with live matches and readable building blocks. Iterate safely with instant feedback and shareable patterns.

FAQ

What does it help with?

Constructing and testing regular expressions with live matches.

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