CODEWITHSUNDEEP
javascriptregex
Cony LuLu
Cony LuLu

Reputation: 69

JS Regular Expression Error: Unterminated character class

I have one regular expression:

var regex = /[.．·・⋯•。~～〜><'"()%/\\]/g;

And I'm trying to define the pattern as string, then declare it as regular expression like this:

var charToFiltered = `[.．·・⋯•。~～〜><'"()%/\\]`;
var regexA = new RegExp(charToFiltered, 'g'); 

But I get the following Error:

Invalid regular expression: /[.．·・⋯•。~～〜><'"()%/]/: Unterminated character class

Upvotes: 1

Views: 2999

Answers (1)

Pavel Lint
Pavel Lint

Reputation: 3527

It works if you move backslash to the start of the character set: 

var charToFiltered = `[\\.．·・⋯•。~～〜><'"()%/]`;
var regexA = new RegExp(charToFiltered, 'g'); 
console.log(regexA);

The reason for that is your \\ turns into single backslash and then you have \] construction in your regexp which means ] literally. So your closing bracket becomes a part of the character class, and then you miss the actual closing ]. All you need to do to resolve that is to move the backslash to someplace where it doesn't escape anything.

Upvotes: 2

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