Inserting variable into JavaScript String.Match Regex

Asked Oct 17 '18 at 16:01

Active Oct 17 '18 at 16:07

Viewed 22 times

I need to extract the string between the first occurrences of given word and dot (.).

The following code works fine and extracts the string between the first occurrence of the word 'located' and the first occurrence of '.'. In this case, it produces the answer: "in Canada".

var myStr = "Toronto is located in Canada. And located in USA.";
var matches = myStr.match(/\located(.*?)\./);
var str = matches && matches.length ? matches[1] : '';
alert(str);

But I need to be able to supply given word as a variable and insert it into String.Match regex.

I've tried this:

var myStr = "Toronto is located in Canada. And located in USA.";
var test = "located";
var regex = new RegExp("/\"" + test + "(.*?)\./");
var matches = myStr.match(regex);
var str = matches && matches.length ? matches[1] : '';

alert(str);

But it doesn't work. What am I doing wrong?

edited Oct 17 '18 at 16:07

asked Oct 17 '18 at 16:01

jjj

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I've updated the code. That was pasted in by mistake. Problem remains. – jjj Oct 17 '18 at 16:08
Any ideas would be more than appreciated, I've wasted some time on this already, unable to figure this out. – jjj Oct 17 '18 at 16:08
Check the documentation of [`RegExp`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp) and what the parameters have to look like – Andreas Oct 17 '18 at 16:11
2

Try it like this `var regex = new RegExp(test + "(.*?)\\.");` – The fourth bird Oct 17 '18 at 16:11
Use `var regex = new RegExp(test.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&') + "([^.]+)");` – Wiktor Stribiżew Oct 17 '18 at 16:13
Awesome, this worked. Thanks for saving me the time, I was running out of ideas. – jjj Oct 17 '18 at 17:11

Inserting variable into JavaScript String.Match Regex

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