Simple regular expression for a decimal with a precision of 2

Question

What is the regular expression for a decimal with a precision of 2?

Valid examples:

123.12
2
56754
92929292929292.12
0.21
3.1

Answer 1

This worked with me:

(-?[0-9]+(\.[0-9]+)?)

Group 1 is the your float number and group 2 is the fraction only.