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command/script to extract a substring from a string

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# 1  
Old 09-20-2006
command/script to extract a substring from a string

I have a long string "<ID type="Oid">{[ManagedElement(Key=rvpdn-nvl-mayo-17)][PhysicalRoot][Chassis][Slot(SlotNum=10000)][Module][Port(PortNumber=GigabitEthernet0/1)][PhysicalLayer][DataLinkLayer]}</ID>"

I need to extract "GigabitEthernet0/1" from the above string.
How can it be done? Smilie
# 2  
Old 09-20-2006
I can use cut -d')' -f3 | cut -d'=' -f2
Any other elegant way in unix?
# 3  
Old 09-20-2006
port_number=`echo "$long_string" | sed 's/.*PortNumber=\([^)]*\).*/\1/' `

# 4  
Old 09-20-2006
Using expr...
port_number=$(expr "$long_string" : ".*PortNumber=\([^)]*\).*")

# 5  
Old 09-21-2006
alternatively in Python:

import re
longstring = '"<ID type="Oid">{[ManagedElement(Key=rvpdn-nvl-mayo-17)][PhysicalRoot][Chassis][Slot(SlotNum=10000)][Module][Port(PortNumber=GigabitEthernet0/1)][PhysicalLayer][DataLinkLayer]}</ID>"'
get = re.findall(".*PortNumber=(.*)\)",longstring)
print get

# 6  
Old 09-21-2006
Thanks to all.

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