Javascript: Match a whole line with a certain pattern

Question

Javascript: Match a whole line with a certain pattern

I've a file like following

// Variables

// Greys
@linkColor:                 #000;

// Links
@linkColorHover:        darken(@linkColor, 15%);

// Fonts
@sansFontFamily:        "Helvetica Neue", Helvetica, Arial, sans-serif;
@altFontFamily:         @sansFontFamily;

// Size
@baseLineHeight:        20px;

I can read the file line-by-line. Is there any way to check a line, if it's not comment by regular expression.

javascript
regex
node.js

Answer 1

Live example

This regular expression:

var isCommentLine = function (line) {
    var rex = /^\s*\/\/.*$|^\s*\/\*.*\*\/\s*$/;
    return rex.test(line);
}

Will return

true for the following 4 lines:

// hello world
   // some comment
/* other comment */
   /* yet another one */

false for multiline comments

/* hello
 * thing
   bing
   world */

false for mixed code - comment lines:

color: red; // red color

So if your usecase is ok with this then you can use it