find text in string with variable

Question

I'm getting the string in this format

var text = '{"STATUS_NEW":"12345678","STATUS_OLD":"87654321","TEXT":"blahblah"}';

to parse this string, i'm use this code:

var pattern = /"STATUS_NEW":"12345678"/;
var exists = pattern.test(text);
if(exists){console.log('ok');}

All work fine! console get me "ok". But I need to paste my var into 'pattern'. I tried this:

var status = '12345678'; var pattern = /"STATUS_NEW":"/ + status + /"/; //not work!

I tried to set 'status' without quotes, and it doesn't work.

score 0 · Accepted Answer · answered Sep 23 '16 at 11:08

You could use RegExp with a string, which you concatinate.

var text = '{"STATUS_NEW":"12345678","STATUS_OLD":"87654321","TEXT":"blahblah"}',
    status = '12345678',
    pattern = new RegExp('"STATUS_NEW":"' + status + '"'),
    exists = pattern.test(text);

if (exists){
    console.log('ok');
}

score 0 · Answer 2 · edited May 23 '17 at 12:00

0

According to https://stackoverflow.com/a/185529/3711952 you have to do something like:

var pattern = new RegExp("some regex segment" + /*comment here */
              segment_part + /* that was defined just now */
              "another segment");

So in your case it will be:

var status = '12345678'; 
var pattern = new RegExp(/"STATUS_NEW":"/ + status + /"/);

edited May 23 '17 at 12:00

Community

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answered Sep 23 '16 at 11:18

user3711952

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find text in string with variable

2 Answers2