feat: support custom regexp

[Anonym-tsk]

Support custom regexp parsing using options: { regexp: /regexString/ }

[eddiemonge]

thought I already merged this for some reason. Need to do some testing to make sure it works before though.

[eddiemonge]

Needs a rebase on top of the semver update.

[Anonym-tsk]

Done

[eddiemonge]

gut feeling says the option should be options.regExp.

@schechter can you confirm the escaping on the regex is good?

[schechter]

Yes, I've tested the new RegExp with all bumping options and it is working as expected.

Additionally, the [\\d||A-a|.|-]* portion can also be removed and all bumping options still work (with and without a prereleaseName) if you want to take this opportunity to shorten the RegExp.
i.e.:var VERSION_REGEXP = opts.regexp || new RegExp('([\'|\"]?version[\'|\"]?[ ]*:[ ]*[\'|\"]?)(\\d+\\.\\d+\\.\\d+(-' + opts.prereleaseName + '\\.\\d+)?(-\\d+)?)([\'|\"]?)', 'i');

[eddiemonge]

that would make a nice pr

[schechter]

Will look into that one more 1st (actually I'd like to add some tests around that before make more changes to the RegExp. (I think it would need to take into account the possible differences if the option for git describe are changed.)