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
\Qescape in double-quoted strings.
If EXPR is omitted, uses
\E) are useful when interpolating strings into regular expressions, because by default an interpolated variable will be considered a mini-regular expression. For example:
'The big bad wolf jumped over...'.
On the other hand:
Will both leave the sentence as is. Normally, when accepting string input from the user, quotemeta() or
\Qmust be used.