Say that we have an element with these classes: "floatLeft item4".
If I want to save the number "4" to a variable from "item4" how would i do that?
I think I would use this pattern "/item(\d+)/" but do I use replace or match and how?
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4 Answers
using replace:
"floatLeft item4".replace(/.*item(\d+)/,"$1")
using match:
"floatLeft item4".match(/item(\d+)/)[1]
exec (alot like match)
/item(\d+)/.exec("floatLeft item4")[1]
using split (again, alot like match):
"floatLeft item4".split(/item(\d+)/)[1]
though the split method is not supported in all browsers (like IE..)
1 Comment
Andreas Louv
You shouldn't split with regex in <=IE8
var str = "item4",
num = (str.match(/item([0-9]+)/)||[])[1]; // if no match, `match` will return null therefore the `|| []` (or empty array).
console.log(num); // "4" (typeof num === "string")
console.log(+num) // 4 (typeof num === "number")
Comments
You can use match like this:
var str = "item4",
num = +str.match(/item(\d+)/)[1]; // => 4
I used unary + to cast to a number. You can use parseInt or Number constructor instead.
Comments
You need to use .match(..) with a capture group.
"floatLeft item4".match(/item(\d+)/)
// Result: ["item4", "4"]
