Question

I’ve been trying for a while to find a regular expression that I need.
3 characters before . and two characters after the decimal point.

I try this

[+ -]?[0-9]{0,3}[.]?[0-9]{0,2}    # but accepted as 55555 or the 
[+ -]?[0-9]{0,3}[.][0-9]{0,2}     # but this is not accepted as the 44 

Can someone help me?

Answer 1

Use this:

^[+ -]?[0-9]{1,3}([.][0-9]{1,2})?$ 

See it live

I added anchors at the beginning and end. If these are ommitted 55555 produces two matches: 555 and 55.