How to pass a variable into regex in jQuery/Javascript

Question

Is there a way to pass a variable into a regex in jQuery/Javascript?

I wanna do something like:

var variable_regex = \"bar\";
var some_string = \"foo         


        

Answer 1

Javascript doesn't support interpolation like Ruby -- you have to use the RegExp constructor:

var aString = "foobar";
var pattern = "bar";

var matches = aString.match(new RegExp(pattern));

Answer 2

It's easy:

var variable_regex = "bar";
var some_string = "foobar";

some_string.match(variable_regex);

Just lose the //. If you want to use complex regexes, you can use string concatenation:

var variable_regex = "b.";
var some_string = "foobar";

alert (some_string.match("f.*"+variable_regex));

Answer 3

Another way to include a variable in a string is through string interpolation. In JavaScript, you can insert or interpolate variables in strings using model literals:

var name = "Jack";
var id = 123321;

console.log(`Hello, ${name} your id is ${id}.`);

Note: be careful not to confuse quotation marks or apostrophes for the serious accent (`).

You can use in function:

function myPhrase(name, id){
   return `Hello, ${name} your id is ${id}.`;
}