regex For Float Numbers with Limits

Question

I need regex Expression for Floating and whole numbers that have the limit like it will accept 1 or 2 digit before point and 1 or 2 digits after point. Whole number limit should be 2 digit. What should be valid:

 - 1.1
 - 11.1
 - 1.11
 - 11.11
 - 2
 - 22

What should be invalid:

 - 111.111
 - 222
Here is my Regex:
/^\d{1,2}(\.\d){1,2}?$/


But it is not working properly
kindly help me in this

Answer 1

Try this:

/^\d{1,2}(\.\d{1,2})?$/

Making the 2nd part of the regex optional

Answer 2

Use the following pattern:

^\d{1,2}(?:\.\d{1,2})?$

See the regex demo.

Details:

• ^ - start of string
• \d{1,2} - 1 or 2 digits
• (?:\.\d{1,2})? - an optional sequence of:
  • \. - a dot
  • \d{1,2} - 1 or 2 digits
• $ - end of string.