RFR: 755: Anything starting with a "/" is treated as a command

[Vijay Kulkarni]

On Fri, 24 Feb 2023 14:38:34 GMT, Vijay Kulkarni <duke at openjdk.org> wrote:

> 755: Anything starting with a "/" is treated as a command

Thanks for the above feedback, so as per the suggestions I will
    1. consolidate the patterns and move those to the common module
    2. modify the regex to verify that the command starts with a lowercase

**Question**: In case the command starts with '/' but does not match with the standard command regex, do we need to provide suggestions based on the mistyped command in the message (e.g. Do you mean 'integrate' instead of 'intergate'?) or a generic warning message suggested by Kevin well enough?

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PR: https://git.openjdk.org/skara/pull/1479