Regex test and store result in javascript

开发者_运维知识库In ruby, I often use something like this:

if "my string123" =~ /string(\d+)/
  puts "I got #{$1}"
end

How would I do something similar in javascript? Currently, I've been doing this but it feels dirty.

m = "my string123".match(/string(\d+)/)
if (m)
  puts "I got " + m[1]

Perhaps I should just live with this, but thought I'd ask if there was a syntax subtelty I was missing. Thanks!

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You aren't missing anything.
If m is already defined, you could do if(m = "string".match(/regex/)), but this is less clean anyway, and you cannot use that with var.

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this is just for testing the appearance of the expression in the text:

    var a = "my string123"; //or given as data..
    var b = /string(\d+)/;
    if (b.test(a)) alert("found some digits inside");

this is for getting an array of matches:

var str = "Watch out for the rock!".match(/r?or?/g);

str then contains ["o","or","ro"]