regx

var (
	C_d regx = `\d` // Matches any digit (0-9).
	C_D regx = `\D` // Matches any non-digit character.
	C_w regx = `\w` // Matches any alphanumeric character plus "_" (word character).
	C_W regx = `\W` // Matches any non-word character.
	C_s regx = `\s` // Matches any whitespace character (space, tab, newline, etc.).
	C_S regx = `\S` // Matches any non-whitespace character.
)

var (
	C_alnum regx = `[:alnum:]`
	C_cntrl regx = `[:cntrl:]`
	C_lower regx = `[:lower:]`
	C_space regx = `[:space:]`
	C_alpha regx = `[:alpha:]`
	C_digit regx = `[:digit:]`
	C_print regx = `[:print:]`
	C_upper regx = `[:upper:]`
	C_blank regx = `[:blank:]`
	C_graph regx = `[:graph:]`
	C_punct regx = `[:punct:]`
	C_hexad regx = `[:xdigit:]`
)