Hopefully this will help (using your input file) #!/usr/bin/env python import re buildinfo = "input.txt" input = open(buildinfo, 'r')
regex = re.compile(r"^\s*build.number=(\d+)\s*$")
for line in input:
if re.search(regex, line):
print line
buildNum = re.sub(r"^\s*build.number=(\d+)\s*$", "\\1", line)
print line
print buildNum
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