regex to remove all text before a character

Question

Is there an easy way to remove all chars before a \"_\"? For example, change 3.04_somename.jpg to somename.jpg.

Any suggestions for where t

Answer 1

no need to do a replacement. the regex will give you what u wanted directly:

"(?<=_)[^_]*\.jpg"

tested with grep:

 echo "3.04_somename.jpg"|grep -oP "(?<=_)[^_]*\.jpg"
somename.jpg