How I can extract specific target number from text file

saratoon J. Published at Dev

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saratoon J.

Input from text file

mpls switch-l2vc 10.123.150.98 205131102 tunnel-policy TE between 10.123.130.1 
mpls switch-l2vc 10.123.150.100 213131302 tunnel-policy TE between 10.123.130.1 
mpls switch-l2vc 10.123.149.52 205129302 tunnel-policy TE between 10.123.130.1 
mpls switch-l2vc 10.123.149.50 205129102 tunnel-policy TE between 10.123.130.1
mpls switch-l2vc 10.123.159.38 212134501 tunnel-policy TE between 10.123.130.1 
mpls switch-l2vc 10.123.150.99 205131202 tunnel-policy TE between 10.123.130.1 
mpls switch-l2vc 10.123.150.99 205131212 tunnel-policy TE between 10.123.130.1

Expect out out ## --(keep only start "205")

mpls switch-l2vc 10.123.150.98 205131102 tunnel-policy TE between 10.123.130.1 
mpls switch-l2vc 10.123.149.52 205129302 tunnel-policy TE between 10.123.130.1 
mpls switch-l2vc 10.123.149.50 205129102 tunnel-policy TE between 10.123.130.1
mpls switch-l2vc 10.123.150.99 205131202 tunnel-policy TE between 10.123.130.1 
mpls switch-l2vc 10.123.150.99 205131212 tunnel-policy TE between 10.123.130.1

From expect output : I prefer select that row contain number is "205" in the fourth boundary text in row.

Tim Biegeleisen

We could try a regex approach using re.search:

with open('input.txt') as f:
    lines = f.readlines()

for line in lines:
    if re.search(r'^\S+ \S+ \S+ 205\d+.*$', line, re.M):
        print(line)

Collected from the Internet

Please contact [email protected] to delete if infringement.

edited at2021-08-8

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