Create default regex tests

[shepdl]

Create tests of default regex patterns for the application that would be useful users unfamiliar with regexes. Consider each regex by what it means to a human reader, not what the character pattern looks like. For example, "keep contractions together", not "word as a set of word characters plus single quotes."

Some examples:

1. All unicode "word" characters
2. Hyphenation-preserving regexes
3. Contraction-preserving regexes

Acceptance tests:

1. Set of patterns with meaningful names
2. Comprehensive suite of tests for all regexes that builds a SpacePreservingLexer with each regex and tests several cases including edge cases.