sed : snippet

Keep the first match and remove the rest match from file

sed 'PATTERN\s*$/d' -i path_to_file

Python regex

#!/usr/bin/python

import re

regexPattern = re.compile('^(?!\\/usr\\b|\\/var)(\\/[\\w]+)+\\/?$')

inputString = [ "/", "/usr", "/var", "/test" ]

for v in inputString:

    m = re.match(regexPattern, v)

    print("")

    print("Test String " + v )

    if m:

        print("Full Match" + m.group())

        print("Pass")

    else:

        print("No Match")