Returns the value of EXPR with all non-"word" characters backslashed. (That is, all characters not matching /A-Za-z_0-9/ will be preceded by a backslash in the returned string, regardless of any locale settings.) This is the internal function implementing the \Q escape in double-quoted strings.
If EXPR is omitted, uses $_ .
They say that time changes things, but you actually have to change them yourself.