JAVASCRIPT

regex match letters and special characters

var pattern = /^[a-zA-Z0-9!@#$%^&*()_+-=[]{};':"|,.<>/?]*$/

regex 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-Z