Converting user input string to regular expression

Question

I am designing a regular expression tester in HTML and JavaScript. The user will enter a regex, a string, and choose the function they want to test with (e.g. search, match,

Answer 1

Use the JavaScript RegExp object constructor.

var re = new RegExp("\\w+");
re.test("hello");

You can pass flags as a second string argument to the constructor. See the documentation for details.