Try 

#! perl -slw
use strict;

$/ = "!\n"; ## set the delimiter

while( <DATA> ) {
    print "'$_'";
}

__DATA__
interface GigabitEthernet6/10
 description TRUNK-KBV-SW001
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,30,31,45,156-158
 switchport mode trunk
 switchport nonegotiate
!
interface GigabitEthernet6/11
 description Offices
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet6/12
!

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In reply to Re: Matching a cisco interface config by BrowserUk
in thread Matching a cisco interface config by FloydATC

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