CODEWITHSUNDEEP
iosregexswiftxcode
user2636197
user2636197

Reputation: 4122

Swift ios regex to only allow postive numbers 1 and up

I am trying to make a regex that only allows positive numbers starting from 1 and up E.g.:

1 // pass
23 // pass
023 // fail
00234 // fail
2340 // pass

So far I have this "^0[0-9].*$" but this will only allow numbers starting with 0 which I dont want.

So how can I make a regex that only supports positive numbers/integers

Upvotes: 2

Views: 3148

Answers (3)

Code Different
Code Different

Reputation: 93151

If your strings contain only the number with possible 0 padding, use hasPrefix 

let str = "00234"
let match = !str.hasPrefix("0") // false

Upvotes: 1

Mohammed Shakeer
Mohammed Shakeer

Reputation: 1504

Use following regular expression to input the numbers starting from 1 to 9

"^[1-9][0-9]*$"

Upvotes: 1

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726489

What I mean is starting from 1 and up

Regex for a decimal number that doe not start in 0 is as follows:

^[1-9][0-9]*$

Note that this regex will match sequences of digits that could not be represented as built-in numeric types in Swift.

Upvotes: 4

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