Extract string between two symbols

user_2300940 0
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I am looking for a way to extract the string between "/" and "_" in the following examples. I tried this command but it doesn't work with special characters: sed -e 's//(.*\)_/\1/'

input:

Sometext/CPCT02010547T_sometext

out:

CPCT02010547T
sed unix
1 Answers

You can use

sed -n 's/.*\/\(.*\)_.*/\1/p'
sed -En 's~.*/([^_]*)_.*~\1~p'

The -n option suppresses the default line output and p prints the result of substitution.

The first pattern is a POSIX BRE regex:

  • .* - match any text
  • \/ - matches a /
  • \(.*\) - a capturing group (\1) in a POSIX BRE (first) pattern
  • _ - a _ char
  • .* - the rest of the string.

The second regex is a POSIX ERE regex (note the -E option) and the ~ is used as a regex delimiter char to avoid escaping /. The only big difference between the first and second is the capturing group pattern, ([^_]*) matches any zero or more chars other than a _.

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