javascriptregexsnakecasing

What is a regex expression for matching snake case in JavaScript?

I'm trying to build a Regex expression for matching just snake case strings. I'm not really good at Regex. What I've built is:

([a-zA-Z]+)_([a-zA-Z]+)

But this isn't quite good because it doesn't match all the cases. I want to be able to add more words, not just 2, and also, I want to match just letters and the underscore.

I want to use this with JavaScript.

Solution 
  • [a-zA-Z]+(_[a-zA-Z]+)*

    should work fine

    Version with non-capturing groups:

    [a-zA-Z]+(?:_[a-zA-Z]+)*