Use gsub which does global substitution:
echo This++++this+++is+not++done | awk '{gsub(/\++/," ");}1'
sub function replaces only 1st match, to replace all matches use gsub.
The 1 at the end tells AWK to print out the line after it's been gsubed on. You can avoid it by explicitly adding a print statement to the same action as the gsub, e.g. {gsub(/\++/," "); print;}
– Andrey Kaipov
CommentedOct 22, 2019 at 18:14
來源：https://stackoverflow.com/questions/14432209/substitute-a-regex-pattern-using-awk#14432241