Return a regexp for each special category
get-matcher also returns the groups
Word delimiters need to be properly converted to strings
Add search helpers
Add forward and backward searchers for 'matcher'
Add missing argument
Rename the search utilities
When forward-searching, move to the end of match, and to beg when backw.
Add word delim helper
Change the return type of search functions (now returns match-data)
Update the requirements on ppar-pairs