Defining regex in Javascript

Question

I need to define below regex in Javascript:

(\bin region\b)(?!.*\1).+?(?=<)

I tried like below but it looks like not working:

var reg = new RegExp ('(\bin region\b)(?!.*\1).+?(?=<)');

Although the Atom tool matches the regex in the target string, JavaScript code is returning blank. I am using this in Azure logic app (inline code executor connector) Anyone can help me with this?

You can see it matches the text in Atom:

See https://stackoverflow.com/questions/17863066/why-do-regex-constructors-need-to-be-double-escaped — The fourth bird, Apr 03 '21 at 08:42

score 1 · Accepted Answer · answered Apr 03 '21 at 08:44

1

Inside a string you need to escape the backslashes.

Otherwise the backslash will escape the next character. So, writing \b will escape the character b instead use \\b which will escape the \

var reg = new RegExp ('(\\bin region\\b)(?!.*\\1).+?(?=<)');

answered Apr 03 '21 at 08:44

Som Shekhar Mukherjee

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Thanks @Som for the quick response but it still doesn't work. String is like Error rate is high in application | In Region - ru
Enrichment Query Details:
","RenderType":"Html","Initials":null,"SubmittedByDisplayName":null,"ChangedByDisplayName":null,"IsFromConnector":true}]}} and I am trying to get the 'In Region RU' like text. – vivek mishra Apr 03 '21 at 08:59
Can you please share the string you are trying to match? @vivekmishra – Som Shekhar Mukherjee Apr 03 '21 at 09:00
There might be a problem with how you are using the regex. – Som Shekhar Mukherjee Apr 03 '21 at 09:17

Defining regex in Javascript

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