Question

How do I modify this regex so that 0 isn’t matched, but the number like 15.0 is? See: http://rubular.com/r/8OMVYh0SBw. I can’t quite figure it out. Regex is my Achilles heel.

^[+-]?(?:(?!0)\d{1,2}|0)(?:\.5)?$

FYI – everything above the dashed line is supposed to be matched, and anything below shouldn’t be matched.

Answer 1

This works perfectly for me.

rubular

^[+-]?(?:[1-9]\d?)(?:\.\d)?$

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For the future, the following two are equivalent, but the latter is more efficient.

(?!0)\d{1,2}    
[1-9]\d?