How to count non-empty lines inside a string in javascript

Question

i'm using this function to count empty lines inside a string.

function count_empty_lines(text){
    return text ? (text.match(/^[ \t]*$/gm) || []).length : 0;
}

I'm trying to edit that regex in order to implement a function that counts non empty lines.

function count_non_empty_lines(text){
}

Any ideas? Thanks!

georg · Accepted Answer · 2015-02-04 16:58:43Z

10

text = ["  a", "b", "", "c", "", "", "   d  "].join("\n")

cnt = (text.match(/^\s*\S/gm) || "").length
alert(cnt)

answered Feb 4, 2015 at 16:58

georg

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1 Comment

Avinash Raj Over a year ago

Why a simple ^.*?\S will do the job. Note that \s matches newline characters also.

blgt · Accepted Answer · 2015-02-04 17:00:38Z

0

You could simply .split("\n").length to get the number of all lines and subtract your existing result from that:

function count_non_empty_lines(text){
    return text.split("\n").length - count_empty_lines(text);
}

answered Feb 4, 2015 at 17:00

blgt

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3 Comments

Andres SK Over a year ago

of course, but that would not be the most efficient way to achieve that.

blgt Over a year ago

No, but it is the simplest

Andres SK Over a year ago

Since I'll be processing lots of strings I need the most efficient and fast way to retrieve the data. @georg 's answer seems to be the best approach. Thanks anyways!

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