Question

$aa = "Main:http://google-test.com:8080/service"

(or)

$aa = "http://google-test.com:8080/service2"

I want to split this into two parts:

Main:

http://google-test.com:8080/service

But it is not working with this split:

split (/\:/,$aa,1);

Answer 1

You need change the limit from 1 to 2.

perl -le 'my $aa="Main:http://google-test.com:8080/service"; my @parts = split(/:/, $aa, 2); print scalar @parts;'

From perldoc -f split:

If LIMIT is specified and positive, it represents the maximum number
of fields the EXPR will be split into,

It looks like you were trying to use it as the maximum number of times to split and not the number of parts to return.