edge cases

[jonschlinkert]

List of edge cases that need to be addressed:

• leading ./
• windows path separators - (how) should matching behavior differ on windows vs. other platforms?
• leading ! - behavior of a single or multiple consecutive !
• ** preceded by or followed by parens, brackets, or braces. In bash, ** only match slashes when it is the only thing in a path segment. However, since non-bash globbing isn't constrained to the same rules as bash (since bash globbing rules are designed to avoid collision with other bash syntaxes), we can support more regex features. For example, the following pattern (in node.js) would conditionally match the preceding ./ in a filepath: ?(./)**/*.js. IMHO, that should be a valid pattern.
• braces as regex quantifiers
• behavior of +, ? and * following brackets, parens, or braces