How many kinds of regex are there, and whether they all are same for the Linux command find grep sed awk vim and JAVA language?
How many kinds of regex are there, and whether they all are same for the Linux command find grep sed awk vim and JAVA language? Which one is the standard regex?
How many kinds of regex are there, and whether they all are same for the Linux command find grep sed awk vim and JAVA language?
===

How many kinds of regex are there, and whether they all are same for the Linux command find grep sed awk vim and JAVA language? Which one is the standard regex?