in many situations where on the first sight a simple C<()*> looks like
the correct solution. Suppose we parse text with comments being delimited
by C<#> followed by some optional (horizontal) whitespace. Contrary to
-its appearence, C<#[ \t]*> I<is not> the correct subexpression to match
+its appearance, C<#[ \t]*> I<is not> the correct subexpression to match
the comment delimiter, because it may "give up" some whitespace if
the remainder of the pattern can be made to match that way. The correct
answer is either one of these: