How to validate a percentage to two decimal places with a Regex?

Question

Is there a regex that would validate a percentage value to 2 decimal places?

I have a regex for two decimal places, but don't know how to stop values above 100. e.g. 100.01 is validated with my regex.

Answer 1

In Perl:

/(^100([.]0{1,2})?)$|(^\d{1,2}([.]\d{1,2})?)$/

or you can just add an extra if comparing 100 exactly :)

Answer 2

Try this one:

\d{1,2}\.\d{2}

That gives you a one digit or two digit number followed by exactly two decimal places. If you want to allow tenths as well (ala 10.1) then try this:

\d{1,2}\.\d{1,2}

Answer 3

/^(?:100(?:.0(?:0)?)?|\d{1,2}(?:.\d{1,2})?)$/

Works with:

• 100
• 100.0
• 100.00
• 99.99
• 0.01
• 5

etc.