Table of Contents
Regular Expression Operators reference
\<symbol> (no special)^, $, .[..], [^...](...), |*, +, ?{n}, {n,}, {n,m},[:alpha:], [:alnum:], [:digit:], [:xdigit:][:lower:], [:upper:][:blank:] (spaces and tabs) [:space:] (space)[:print:] (printable, including spaces)[:graph:] (printable and visible, excluding spaces)[:punct:] (punctuation), [:cntrl:] (control)
Print only the regex matched part howto
- Use
substr() with RSTART and RLENGTH, which are provided by match().
awk 'match($0, /regex/) { print substr($0, RSTART, RLENGTH) } ' file