Javascript Regex multi space "\s" doesn't work in chrome

Question

I try to use this Regex

new RegExp('utm_source=Weekly\SRecommended\SJobs\SEmail', 'ig');

When I try to use it in regex101 or regexr it works.

And in my code doesn't work.

I try to use this in console this is the result is

/utm_source=WeeklysRecommendedsJobssEmail/gi

the code without spaces.

When I try to use space letter it works.

Any help?

`new RegExp('utm_source=Weekly\\SRecommended\\SJobs\\SEmail', 'ig');` — Pranav C Balan, Jan 05 '17 at 10:41
The reason is that ``\S`` is an *undefined escape sequence* in a JS string literal and backslashes in these escape sequences are just discarded from the string. The problem is known, highly frequent, no need to repeat "double the brackslashes", thus, question is closed. — Wiktor Stribiżew, Jan 05 '17 at 11:04

score 0 · Accepted Answer · answered Jan 05 '17 at 10:45

Because \ is an escape character for regular expressions and strings. You have to escape the \ if you're creating a regex from a string:

new RegExp('utm_source=Weekly\\SRecommended\\SJobs\\SEmail', 'ig');

Or simply use a regex literal which exists precisely to avoid this problem:

/utm_source=Weekly\SRecommended\SJobs\SEmail/ig

1 Answers1