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    safe-regexpublic

    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.

    browser support

    build status

    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'
    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-regex
    

    license

    MIT

    install

    npm i safe-regex

    Downloadsweekly downloads

    1,785,290

    version

    1.1.0

    license

    MIT

    repository

    githubgithub

    last publish

    collaborators

    • avatar