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If JavaScript, /\.scss$/ is a regex. I want to check whether a regex is exactly the same as another regex, however:

/\.scss$/ === /\.scss$/ // false

How can I do this? Note that I do not care about what the regex matches, I only care about the way the regex is defined.

If JavaScript, /\.scss$/ is a regex. I want to check whether a regex is exactly the same as another regex, however:

/\.scss$/ === /\.scss$/ // false

How can I do this? Note that I do not care about what the regex matches, I only care about the way the regex is defined.

  • javascript
  • regex
  • equality
Share Improve this question edited Mar 31, 2016 at 8:55 sennett asked Mar 31, 2016 at 8:42 sennettsennett 8,45411 gold badges49 silver badges72 bronze badges 1
  • typeof /\.scss$/ is "object" and two objects cannot be pared using equality operators. – Tushar Commented Mar 31, 2016 at 8:53
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2 Answers 2

Reset to default 7

Use .toString:

/\.scss$/.toString() === /\.scss$/.toString() // true

It's easier to see what is going on when using the RegExp object:

new RegExp("ab+c").toString() === new RegExp("ab+c").toString() // true

whereas 

new RegExp("ab+c") === new RegExp("ab+c") // false

How about using source attribute?

/\.scss$/.source === /\.scss$/.source && /\.scss$/.flags === /\.scss$/.flags

It's faster then using toString function. http://jsperf./source-vs-tostring

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