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!
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.
var, it could be extremely important: stackoverflow.com/search?q=javascript+var
var, let, and const do at this point, given its been 12 years, but I think I'll tell others if they don't know. (note, var is not often used in modern Javascript). var is a keyword in JavaScript that is used to declare a variable in the current scope. While it is true that in JavaScript, you could declare a variable without using the var keyword, it is generally considered bad practice to do so. Let is another keyword, but prevents you from accessing a variable outside the scope it was defined in (though you can access it in a child scope).const is another way to declare variables, but you can't redefine a value, nor change it, however, you can mutate the value, for example in this scenario: const myArray = [1,2,3]. This throws an error: myArray = [4,5,6] But this works: myArray.push(4) Or myArray.pop() etc.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"]
/regexp/g. Then your match will be returned inm[0].m, it should probably have thevarkeyword:var m = ...;. Also, I don't think JavaScript hasputs./gflag: you'd get"string123", not"123"`, you're forgetting about the group.