Supported Regex Engines

See which engines run here, their exact versions, what they support and how large they are.

Recorded when this release was built; checking its engine manifest…

JavaScript · This browser

Runs
In this browser, with its own RegExp (version not pinned)
Explanation coverage
Full ECMAScript syntax
Flags
i m s u v y
Version
Not pinned: the RegExp of the browser you are using
Build ID
None (not a pinned build)
Operations
match, extract, replace, split, pipeline
Download
Nothing to download
SHA-256
None (nothing is downloaded)
License
Part of your browser
Limits
Limits 1.0.0+A1

Node.js · Remote

Runs
On a remote runner, only after you confirm the upload
Explanation coverage
Full ECMAScript syntax
Flags
i m s u v y
Version
Not in this release
Build ID
Unknown
Operations
Unknown
Download
Unknown
SHA-256
Unknown
License
Unknown
Limits
Unknown

Python re · Local WASM

Runs
In this browser, as a pinned WebAssembly build downloaded on request
Explanation coverage
Core grammar; syntax outside it is shown as unexplained (partial)
Flags
i m s x a
Version
3.14.2
Build ID
pyodide-314.0.7+85bda2654c0e16aa
Operations
match, extract, replace, split, pipeline
Download
12.9 MB (13,513,276 bytes)
SHA-256
cdc73de107e384063fde6ed3e531050b34edb56b5ccfb08c4b1fb50ef02b6de8
License
MPL-2.0 AND PSF-2.0
Limits
Limits 1.0.0+A1

PCRE2-8 · Local WASM

Runs
In this browser, as a pinned WebAssembly build downloaded on request
Explanation coverage
Core grammar; syntax outside it is shown as unexplained (partial)
Flags
i m s x U J
Version
10.48
Build ID
pcre2-10.48-em6.0.10+636463ee32944ddc
Operations
match, extract, replace, split, pipeline
Download
0.3 MB (329,633 bytes)
SHA-256
39b77b9a1d2f558ece733e1a7472f0870c6e19e6d00259eb4afe173732be0db2
License
BSD-3-Clause WITH PCRE2-exception
Limits
Limits 1.0.0+A1

Go regexp · Local WASM

Runs
In this browser, as a pinned WebAssembly build downloaded on request
Explanation coverage
Core grammar; syntax outside it is shown as unexplained (partial)
Flags
i m s U
Version
1.27.1
Build ID
go1.27.1+3ee26bfb9820095b
Operations
match, extract, replace, split, pipeline
Download
4.8 MB (4,988,441 bytes)
SHA-256
41a28e3bf7801d491fb030c52317ee218fec5a7f05780dd0e8d2ef68e7d3207c
License
BSD-3-Clause
Limits
Limits 1.0.0+A1