Simple rules

Here's a Perl 6 regex to parse simple addition/subtraction statements

\d+ [ '+' | '-' ] \d+ 

Some differences between Perl 5 and Perl 6 regexes

• All non-alphanumeric characters are metasyntactic (non-literal match)

• Literals can be specified using quotes

• Whitespace is metasyntactic

• Square brackets are now non-capturing groups