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1.4 KiB
1.4 KiB
safe-regex2
detect potentially catastrophic exponential-time regular expressions by limiting the star height to 1
This is a fork of https://github.com/substack/safe-regex at 1.1.0.
WARNING: This module has both false positives and false negatives. It is not meant as a full checker, but it detect basic cases.
example
var safe = require('safe-regex2');
var regex = process.argv.slice(2).join(' ');
console.log(safe(regex));
$ node safe.js '(x+x+)+y'
false
$ node safe.js '(beep|boop)*'
true
$ node safe.js '(a+){10}'
false
$ node safe.js '\blocation\s*:[^:\n]+\b(Oakland|San Francisco)\b'
true
methods
var safe = require('safe-regex')
var ok = safe(re, opts={})
Return a boolean ok whether or not the regex re is safe and not possibly
catastrophic.
re can be a RegExp object or just a string.
If the re is a string and is an invalid regex, returns false.
opts.limit- maximum number of allowed repetitions in the entire regex. Default:25.
install
With npm do:
npm install safe-regex2
license
MIT