Regex for stripping leading zeroes

JavaScript
16

These regex’s are getting highly complicated and should never be used in production.

What’s wrong with using a simple if/else condition?

If (this.value = "0") {
    // allow zero to remain
} else {
    // do your regex here
}

Keep it simple, for with complex code the ability to understand it fades with time, and checking later on if there are any bugs becomes near-impossible.