metavida / range_regexp

Generates regular expressions that match a range.

RangeRegexp

Generates regular expressions that match a range.

Ever wanted to write a regex like this?

prefix = /[612-793]/
"650" =~ prefix # => true
"794" =~ prefix # => false

Character classes don't work like that! But now you can:

prefix = RangeRegexp.new(619..793).regexp
"650" =~ prefix # => true
"794" =~ prefix # => false

Happiness!

Installation

Add this line to your application's Gemfile:

gem 'range_regexp'

And then execute:

$ bundle

Or install it yourself as:

$ gem install range_regexp

Usage

Pass a range to the constructor. Get it with #regexp.

re = RangeRegexp.new(12..24).regexp
re =~ "12" # => True

It works with strings if you're clever with your range:

re = RangeRegexp.new("foobar".."foobaz").regexp
re =~ "foobat" # => true

It knows how many characters it matches:

RangeRegexp.new(135..643).size # => 3
RangeRegexp.new(1..9).size # => 1
RangeRegexp.new("foobar".."foobaz").size # => 6

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request