regex all not numbers
echo 1a2b3c | sed 's/[^0-9]//g' #Replaces all not numbers
abcregex all not numbers
echo 1a2b3c | sed 's/[^0-9]//g' #Replaces all not numbers
abcregex match numbers and special characters
echo %H1E2L+L#O! | sed 's/[^A-Z!]//g' #replaces number and special
characters which aren't ! or an uppercase letter A-ZCopyright © 2021 Codeinu
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