list-matches and fold-matches in ice-9 regexp are exported but not
documented. They look pretty useful, I think I'll add some words
about them.
(And I think I'll try to clarify how you ask for both regexp/notbol
and regexp/noteol in the regexp-exec flags. They're a logior if I'm
not mistaken.)
-- Scheme Procedure: list-matches regexp str [flags]
Return a list of match structures which are the non-overlapping
matches of REGEXP in STR. REGEXP can be either a string pattern
or a compiled regexp. FLAGS is as per `regexp-exec' above.
(map match:substring (list-matches "[a-z]+" "abc 42 def 78"))
=> ("abc" "def")
-- Scheme Procedure: fold-matches regexp str init proc [flags]
Apply PROC to the non-overlapping matches of REGEXP in STR to
build a result. REGEXP can be either a string pattern or a
compiled regexp. FLAGS is as per `regexp-exec' above.
PROC is called as `(PROC match prev)' where MATCH is a match
structure and PREV is the previous return from PROC. For the
first call PREV is the given INIT parameter. The final return
from PROC is the return from `fold-matches'.
For example to count matches,
(fold-matches "[a-z][0-9]" "abc x1 def y2" 0
(lambda (m count)
(1+ count)))
=> 2
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