wanting a javascript regex notation for replacing cases

Question

e.g.

I want to write a camelToSnake()

camelToSnake = (phrase) ->
  return phrase.replace(/([A-Z])/g, /-\L$1/)

is there such options

No, you can't do like \L$1 in javascript.

Avinash Raj
– Avinash Raj

2014-10-22 19:42:59 +00:00
Commented Oct 22, 2014 at 19:42 — Avinash Raj
– Avinash Raj, Commented Oct 22, 2014 at 19:42

anubhava · Accepted Answer · 2014-10-22 19:35:12Z

1

You can use this code:

var s = 'camelToSnake';
var r = s.replace(/([A-Za-z])/g, function ($0, $1) { c=$1.charAt(0);
          return (c==c.toUpperCase())?c.toLowerCase():c.toUpperCase(); } );
//=> CAMELtOsNAKE

answered Oct 22, 2014 at 19:35

anubhava

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2 Comments

Wet Noodles Over a year ago

Wouldn't the callback for snake case look more like this? function ($0, $1) { c=$1.charAt(0); return '-' + c.toLowerCase() } ); Or am I misunderstanding snake-case? (Also meant to mention the regex would only check upper-case letters)

anubhava Over a year ago

That's not true it is just reversing the case so it converts lowercase to uppercase and viceversa.

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