bugfix: regex patterns for natural language days have a flaw that allows...

... them to be matched within words: ie. injunction matches 'jun' for month of June. There are other regex patterns i suspect are flawed as well in a similar way, however, only the following based on natural language were modified:

- Constants.RE_MONTH
- Constants.RE_WEEKDAY
- Constants.RE_MODIFIER
- Constants.RE_MODIFIER2
- Constants.RE_DAY