There are several things wrong with /5.1/

• "." inside a regex is special - it matches any character except "\n".
• the regex will match any string that contains the sequence 5, "any char except \n", 1. ie it will match (for example) "501", "5:1", "I have 5.1 experience points"

The solution is to anchor the regex at the start and end of the string, and to escape ".": /^5\.1$/

eq is a far better operator when you want to test if two strings are equal!

See perlretut for a regexp tutorial and perlre for the full monty on regular expressions.

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