Question

I am trying to validate a textbox with a regular expression…

  regex expression=(\d{0,4})?([\.]{1})?(\d{0,2})

I am having a problem with the decimal point. the decimal point is optional. the regex should validate for only one decimal point.

    example 1.00 ,23.22 , .65 is valid
    1..  or  23.. is invalid.

Any suggestions for improving my regex??

Answer 1

Try this one : ^\d{1,4}(\.\d{1,2})?$

It should match :

1
200
9999
12.35
522.4

But not :

1000000
65.
.65
10.326
65..12

Edit :

If you want to match 65. or 9999. use this one instead (see comments) :

^\d{1,4}(\.(\d{1,2})?)?$