Some common regexs

set COMMENT {/\*[^*]*\*+([^/*][^*]*\*+)*/} # regex to match a comment

set COMMENT2 "//\[^\n]*" # regex to match a C++// comment

set DOUBLE {"(\\.|[^"\\])*"} # regex to match doublequoted string

set SINGLE {'(\\.|[^'\\])*'} # regex to match singlequoted constant