Question : Linux string manipulation.

I am looking for a Linux command or script that retrieves a particular string from a file and write it to another file.
 The file to be searched is a log file that may contain e-mail addresses in the following format “no.reply+something+thisstring@domain.com”
I need to retrieve "thisstring" wherever found and write it to another file.

My approach was to search for “no.reply+” substring using grep command and then use another command that retrieves the string between the second + sign and the @ sign, but I need help writhing the complete command.

Any help is appreciating it.

Thanks in advance.

Answer : Linux string manipulation.

grep "no.reply+" filename | cut -d "+" -f 3|cut -d "@" -f 1

That will cut again at the @ sign and return the first field. thisstring.