extract a string after a pattern

Question

I want to extract the numbers following client_id and id and pair up client_id and id in each line.

For example, for the following lines of log,

User(cli         


        

Answer 1

This might work for you (GNU sed):

sed -r '/.*(\(client_id:([0-9]+))[^(]*\(id:([0-9]+)/!d;s//\2 \3\n\1/;P;D' file

• /.*(\(client_id:([0-9]+))[^(]*\(id:([0-9]+)/!d if the line doesn't have the intended strings delete it.
• s//\2 \3\n\1/ re-arrange the line by copying the client_id and moving the first id ahead thus reducing the line for successive iterations.
• P print upto the introduced newline.
• D delete upto the introduced newline.