command/script to extract a substring from a string

girisha · #1 (**permalink**) 09-20-2006

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?

girisha · #2 (**permalink**) 09-20-2006

I can use cut -d')' -f3 | cut -d'=' -f2
Any other elegant way in unix?

aigles · #3 (**permalink**) 09-20-2006

Code:

long_string="
port_number=`echo "$long_string" | sed 's/.*PortNumber=\([^)]*\).*/\1/' `

Jean-Pierre.

Ygor · #4 (**permalink**) 09-20-2006

Using expr...

Code:

port_number=$(expr "$long_string" : ".*PortNumber=\([^)]*\).*")

ghostdog74 · #5 (**permalink**) 09-21-2006

alternatively in Python:

Code:

#!/usr/bin/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

girisha · #6 (**permalink**) 09-21-2006

Thanks to all.

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