How to use user input as an Quantifier in Regex in JS?

Question

My attempt was :

var re = new RegExp("\w{" + n + "}", "g");

But it didn't seems to work.

P.S. - I have searched several questions of Stackoverflow thinking it must have been asked before But I didn't find one, so I asked my question.

I want to split the string, into pairs according to the input (n) given by user. — Divyansh Batham
– Divyansh Batham, Commented Jul 26, 2015 at 18:03
For example String is 'Divyansh' and n is 2 => ['Di','vy','an','sh']; — Divyansh Batham
– Divyansh Batham, Commented Jul 26, 2015 at 18:05
Just this in return statement var arr = str.match(re); where str is the variable having the string. — Divyansh Batham
– Divyansh Batham, Commented Jul 26, 2015 at 18:06

maraca · Accepted Answer · 2015-07-26 18:19:22Z

2

The problem is that \ is not only the escape character in regex but also in JS strings. So when you create a regular expression from a string you need to escape it. This means that \w becomes "\\w" in a string and if you want to match a single \ it would even become "\\\\".

Instead of changing it to \\w you can also use . if you don't care about the characters or if the string was validated before.

answered Jul 26, 2015 at 18:19

maraca

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2 Comments

Divyansh Batham Over a year ago

\ is not only the escape character in regex but also in JS strings I didn't knew that earlier, any link where where I can learn about that is much appreciated ^_^

maraca Over a year ago

@DivyanshBatham I like this source regular-expressions.info/reference.html, but I usually already know what I'm looking for, should still give a good overview. To test regex online there are many sites, just enter the italic text in a search engine. PS: As Jan said, if you put the things you said in the comments in the question it is more likely to get upvoted.

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