Glob expressions for JavaScript

Usage no npm install needed!

<script type="module">
  import gex from '';



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Glob expressions for JavaScript

"When regular expressions are just too hard!"

Match glob expressions using * and ? against any JavaScript data type. The character * means match anything of any length, the character ? means match exactly one of any character, and all other characters match themselves.

const { Gex } = require('gex')

Gex('a*').on( 'abc' ) // returns 'abc'
Gex('a*c').on( 'abbbc' ) // returns 'abbbc'
Gex('a?c').on( 'abc' ) // returns 'abc'

You can also match against objects and arrays:

Gex('a*').on( ['ab','zz','ac'] ) // returns ['ab','ac']
Gex('a*').on( {ab:1,zz:2,ac:3} ) // returns {ab:1,ac:3}

And also match against multiple globs:

Gex(['a*','b*']).on( 'bx' ) // returns 'bx'
Gex(['a*','b*']).on( ['ax','zz','bx'] ) // returns ['ax','bx']

One of the most useful things you can do with this library is quick assertions in unit tests. For example if your objects contain dates, randomly generated unique identifiers, or other data irrelevant for testing, Gex can help you ignore them when you use JSON.stringify:

var entity = {created: new Date().getTime(), name:'foo' }
assert.ok( Gex('{"created":*,"name":"foo"}').on( JSON.stringify(entity) ) )

If you need to use globbing on files, here's how apply a glob to a list of files in a folder:

var fs = require('fs')
  var pngs = Gex('*.png').on(files) 

And that's it!


npm install gex

And in your code:

const { Gex } = require('gex')

Or clone the git repository: git clone git://

This library depends on the excellent underscore module: underscore


The Gex object is a function that takes a single argument, the glob expression. This returns a Gex object that has only one function itself: on. The on function accepts any JavaScript data type, and operates as follows:

  • strings, numbers, booleans, dates, regexes: converted to string form for matching, returned as themselves
  • arrays: return a new array with all the elements that matched. Elements are not modified, but are converted to strings for matching. Does not recurse into elements.
  • objects: return a new object with with all the property names that matched. Values are copied by reference.
  • null, NAN, undefined: never match anything


If you're using this library, feel free to contact me on twitter if you have any questions! :) @rjrodger

This module works on both Node.js and browsers.


Copyright (c) 2010-2020, Richard Rodger and other contributors. Licensed under MIT.