CodeMirror Twitter like highlight

Question

I'm using Twitter API to scheldule Tweets. The App have a Create Template module, I would like to accomplish something like this using CodeMirror:

My actual mode definer looks like:

CodeMirror.defineMode('text/twitter-like', function() {
    return {
        token: function( word, state ){
            if ( word.match(/^_\w+/) ) {
                return "blue-text";
            }
            return false;
        }
    };
});

This is making a infinite loop every time I type something.

Answer 1

The CodeMirror Manual states:

It should read one token from the stream it is given as an argument, optionally update its state, and return a style string, or null for tokens that do not have to be styled.

Did you try to return null instead of false?