Get string inside parentheses, removing parentheses, with regex

Question

I have these two strings...

var str1 = \"this is (1) test\";
var str2 = \"this is (2) test\";

And want to write a RegEx to extract what is

Answer 1

Try:

/[a-zA-Z0-9\s]+\((\d+)\)[a-zA-Z0-9\s]+/

This will capture any digit of one or more inside the parentheses.

Example: http://regexr.com?365uj

EDIT: In the example you will see the replace field has only the numbers, and not the parentheses--this is because the capturing group $1 is only capturing the digits themselves.

EDIT 2:

Try something like this:

var str1 = "this is (1) test";
var str2 = "this is (2) test";

var re = /[a-zA-Z0-9\s]+\((\d+)\)[a-zA-Z0-9\s]+/;

str1 = str1.replace(re, "$1");
str2 = str2.replace(re, "$1");

console.log(str1, str2);