Course of Raku / Regexes and grammars / Regexes / Lookaround assertions / Exercises
Between brackets
Problem
Combine a lookbehind and a lookahead to match a
whole-dollar amount: the digits that come right after a
$ and are not followed by a decimal point.
So $50 matches (50), but $3.99
does not — it has cents.
Use a positive lookbehind for $ and a negative lookahead
for ., and add a >> word boundary after
the digits so the whole number is matched. Print the match for
'$50'.
Example
The program prints:
｢50｣