Explicitly spell out the ranges involved. The original wording always
confused me, but it's actually very sane.
Remove "this doesn't change R_NOTBOL & R_NEWLINE" ‒ so does it change
R_NOTEOL? No. That's weird and confusing.
String largeness doesn't matter, known-lengthness does.
Explicitly spell out the influence on returned matches
(relative to string, not start of range).
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
---
man3/regex.3 | 29 ++++++++++++++++-------------
1 file changed, 16 insertions(+), 13 deletions(-)
diff --git a/man3/regex.3 b/man3/regex.3
index e3dd72a74..a9bec59a9 100644
--- a/man3/regex.3
+++ b/man3/regex.3
@@ -131,23 +131,26 @@ .SS Matching
above).
.TP
.B REG_STARTEND
-Use
-.I pmatch[0]
-on the input string, starting at byte
-.I pmatch[0].rm_so
-and ending before byte
-.IR pmatch[0].rm_eo .
+Match
+.RI [ string " + " pmatch[0].rm_so ", " string " + " pmatch[0].rm_eo )
+instead of
+.RI [ string ", " string " + \fBstrlen\fP(" string )).
This allows matching embedded NUL bytes
and avoids a
.BR strlen (3)
-on large strings.
-It does not use
+on known-length strings.
+If any matches are returned
+.RB ( REG_NOSUB
+wasn't passed to
+.BR regcomp (),
+the match succeeded, and
.I nmatch
-on input, and does not change
-.B REG_NOTBOL
-or
-.B REG_NEWLINE
-processing.
+> 0), they overwrite
+.I pmatch
+as usual, and the match offsets remain relative to
+.IR string
+(not
+.IR string " + " pmatch[0].rm_so ).
This flag is a BSD extension, not present in POSIX.
.SS Match offsets
Unless
--
2.30.2
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