Regular expression to match a word in js

Question

I am trying to match words like lay_10, lay_11, lay_20 with regex but it's not working, any help will be really appreciated.

var patt =new RegExp("/lay/");

if (patt.test("lay_10")){
  alert("matched");
}

You don't need the `/` just use `var patt =new RegExp("lay");` *or* use the literal `if (/lay/.test("lay_10"))` — Mark, Oct 27 '18 at 17:44

score 0 · Answer 1 · edited Oct 27 '18 at 18:04

0

Rewrite your code like the following:

var patt = new RegExp("lay");

if (patt.test("lay_10")) {
  alert("matched");
}

edited Oct 27 '18 at 18:04

skwidbreth

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answered Oct 27 '18 at 17:46

Omid Nikrah

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score 0 · Answer 2 · answered Oct 27 '18 at 18:27

0

const reg = /lay_([0-9]+)/g

if(reg.test(`lay_10`)) {
    console.log(`Matched`)
}

Hope this helps.

answered Oct 27 '18 at 18:27

Mr.DeleteMyMessages

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score 0 · Answer 3 · answered Oct 27 '18 at 18:48

To clarify the other answers, there are two ways to define a regex in JavaScript. Either via new RegExp("lay"); or via /lay/. Since you mixed the two methods, it did not work correctly.

var pattern1 = new RegExp("lay");
var pattern2 = new /lay/           //You can use either one.

if (pattern1.test("lay_10") && pattern2.test("lay_11")) {
  alert("matched"); // matched
}

Regular expression to match a word in js

3 Answers3