REGEX PROBLEM URGENT

Hello,

I need help with a regular expression

the search text is as folows:

-LHR010Y-PAD100

A quick breakdown LHR is airport code which has to be 3
chars
010 is a number which can be 2-3 digits long
-PAD is literal string
and the 100 after it is a number which can be 1-3 digits
long

I know how to do the regex if i split the string in two but
the
problem is i can't
get the regex right for the whole expression. You see the
-PAD100 is
optional
but the -LHR010Y is the mandatory part of the expression. An
Example
-LHR010Y  - valid
-LHR010Y-PAD100 valid
-LHR010Y-             invalid
LHR010Y-PAD     invalid

i can't get it to not match when the second part is invalid.
It always
still matches the first
part. HELP i need to get this right. How do you force a non
match when
the second
half of the search text does not match the second part of
your regex?

Regards

Romeel


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