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regexzeroscientific-notation

Invalidate scientific notation with 0 value exponent or trailing 0s

I am using this solution to regex scientific notation:

/-?(?:0|[1-9]\d*)(?:\.\d*)?(?:[eE][+\-]?\d+)?/

I'd like to add a slight amount of space conservation, so I'd like to also forbid trailing zeros after the decimal point and zero value as the exponent.

I think that adding [1-9] after \.\d will enforce no trailing zeros, but I think it will also force at least two numbers after . which is undesirable.

I do not possess the necessary experience to modify this regex properly.

How can my intent be implemented?

Solution

  • You can make this simple change:

    /-?(?:0|[1-9]\d*)(?:\.\d*[1-9])?(?:[eE][+-]?[1-9]\d*)?/

    Note that [1-9]\d* will forbid exponants with a leading zero.