Match branch names using regex. fixes #1

[dawkaka]

Examples:

Invalid regex:

[bubunyo]

Please rebase your changes on top of master so that your changes are a bit clear. Also it would be nice it you used test cases to validate your changes.

[dawkaka]

Please rebase your changes on top of master so that your changes are a bit clear. Also it would be nice it you used test cases to validate your changes.

The searcher function is not in global scope, can't test without changing almost all the code

[bubunyo]

it is not meant to be. you can implement the searcher as a local function and use test cases to test it.