CODEWITHSUNDEEP
javascriptregex
user1249568
user1249568

Reputation: 23

Javascript regex: How to find length of a match?

I got a task to write code highlighter for C#. Everything's pretty good, but I wish to optimize indentation. So, I have a regexp looking like /(\t|[ ]{4})/g, so I replace tabulation or 4 space chars with <span style="margin-left: 2em;" /> and it looks good, but it creates a lot of unnecessary spans. I want to use something like /^[ ]{x}/g and replace with <span style='margin-left: "+(0.5*x)+"em;' /> to have only one span per line with appropriate margin. str.match() won't work because it searches in all document, not per line.

Upvotes: 0

Views: 352

Answers (1)

icktoofay
icktoofay

Reputation: 129139

If your regular expression has the g flag, you can execute it over and over again, getting all matches from the string, including the length of the match:

var re = /^(\t|[ ]{4})/g;
var match;
while((match = re.exec(text)) {
    // use match.index and match[0].length
}

Upvotes: 2

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