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safe-regex#
detect potentially
catastrophic
exponential-time
regular expressions by limiting the
star height to 1
WARNING: This module merely seems to work given all the catastrophic regular
expressions I could find scouring the internet, but I don't have enough of a
background in automata to be absolutely sure that this module will catch all
exponential-time cases.
example#
var safe = require('safe-regex');
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'
truemethods#
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-regexlicense#
MIT