Crash when processing incorrectly formatted OSC wildcards

[Daniel-Higgott]

If an OSCMethod attempts to match an OSC Address containing an incorrectly formatted square bracketed wildcard, OSCKit crashes. Specifically, the formatting needs to include whitespace to create this crash. For example:

/this/example/[0- 1]/would/crash/OSCKit

/this/example/[0-1]/would/not

The crash occurs within OSCMatch, function:

func matchSquareBracket(pattern: String,
patternCharacterOffset: inout String.Index,
address: String,
addressCharacterOffset: inout String.Index) -> Bool

Thread 1: Fatal error: String index is out of bounds

It would be great if the match could fail silently, rather than throw an exception. I guess you could perform a check for invalid characters on the way in? Or break the While loop before the index is out of bounds...

I'm on the Issue sammysmallman/OSCKit#23 branch, if that makes any difference.

Thanks again for all your work on OSCKit, I especially love the easy pattern matching, when it's not crashing!