Adds info on escaping characters closes #1146

Author: JJ

doc/Language/regexes.pod6

@@ -351,6 +351,10 @@ write the backslashed forms for character classes between the C<[ ]>.
     / <[02468]> /;
     # because the first one also contains "weird" unicodey digits
 
+You can use C<\> to escape characters that would have some meaning in the regular expression:
+
+    say "[- hey -]" ~~ /<-[ \- \] [ \s ]>+/; # OUTPUT: «｢hey｣␤»
+
 To negate a character class, put a C<-> after the opening angle:
 
     say 'no quotes' ~~ /  <-[ " ]> + /;  # matches characters except "