Unique RegEx string

Question

I have a set of requirements that claim that the input should be verified as follows:

• 1 to 7 characters
• Numeric
• More than 0
• and allow decimal point

I currently have ^(?!0{1,7}$)(\d+(\.\d)?){1,7}$

But this does not limit the total string to a maximum of 7 characters.

Answer 1

We can think like this:

^(?=\d+(?:\.\d+)?$)(?![0\.]+$).{1,7}$

• A positive look from the very beginning: it should consist of a number and an optional character .(number template)
• A negative look from the very beginning: it should not consist only of 0and .(a template to exclude the value 0).
• It must have 1 to 7 characters.

Answer 2

Try this regex:

^(?!0\.0$)(?:[1-9]|(?<=[1-9]|\.)0|0?\.(?=\d+)){1,7}$

• 1 9 ().
• 0 :
  • .
  • .
• 7 .

Demo

http://regex101.com/r/kI2gB9

Answer 3

I think this will do the trick:

^(?!0*(\.0*)?$)(?=.{1,7}$)\d+(\.\d+)?$

test: http://jsfiddle.net/29jR6/1/