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exrex — Generate all/random matching strings for a `regex`. It can also simplify `regex`es. More information

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the exrex command: Generate all/random matching strings for a regex. It can also simplify regexes. More information: <https://github.com/asciimoo/exrex#usage>.

Solution

exrex — Generate all/random matching strings for a regex. It can also simplify regexes. More information: <https://github.com/asciimoo/exrex#usage>.

Generate all possible strings that match a regex:

exrex '{{regex}}'

Generate a random string that matches a regex:

exrex {{[-r|--random]}} '{{regex}}'

Generate at most 100 strings that match a regex:

exrex {{[-m|--max-number]}} {{100}} '{{regex}}'

Generate all possible strings that match a regex, joined by a custom delimiter string:

exrex {{[-d|--delimiter]}} "{{, }}" '{{regex}}'

Print count of all possible strings that match a regex:

exrex {{[-c|--count]}} '{{regex}}'

Simplify a regex:

exrex {{[-s|--simplify]}} '{{ab|ac}}'

Print eyes:

exrex '{{[oO0](_)[oO0]}}'

Print a boat:

exrex '{{( {20}(\| *\\|-{22}|\|)|\.={50}| ( ){0,5}\\\.| {12}~{39})}}'

Code Snippets

Generate all possible strings that match a `regex`

exrex '{{regex}}'

Generate a random string that matches a `regex`

exrex {{[-r|--random]}} '{{regex}}'

Generate at most 100 strings that match a `regex`

exrex {{[-m|--max-number]}} {{100}} '{{regex}}'

Generate all possible strings that match a `regex`, joined by a custom delimiter string

exrex {{[-d|--delimiter]}} "{{, }}" '{{regex}}'

Print count of all possible strings that match a `regex`

exrex {{[-c|--count]}} '{{regex}}'

Context

tldr-pages: common/exrex

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