Longest prefix match

[Mihir Kamdar]

Hi,

I want to implement longest prefix match in my code in perl, but am not able
to get started with it. I am sure, it can be easily achieved with the help
of regex in perl, but I haven't worked on it. Following is what I want to
do:-

If the phone number is
+852xxxx ---> The country is Hong Kong
+853xxxx ---> The country is Macau.

I have a list of 65 such countries and their codes. I have to read a
particular field in the CSV file, and on the basis of longest prefix match,
assign a country to it.


Thanks in anticipation,

Mihir