starting after the left margin whitespace (if any) on a line; the
characters it matches are that line's candidate for the fill prefix.
-@c omit binary characters not in the standard TeX fonts, to avoid warnings.
-@iftex
-@w{@code{"[ \t]*\\([-!|#%;>*]+[ \t]*\\|(?[0-9]+[.)][ \t]*\\)*"}}
-@end iftex
-@ifnottex
-@w{@code{"[ \t]*\\([-!|#%;>*·•‣⁃◦]+[ \t]*\\|(?[0-9]+[.)][ \t]*\\)*"}}
-@end ifnottex
-is the default value.
-@iftex
-(A few control characters are in the default value that are not visible here.)
-@end iftex
-This matches a number enclosed in parentheses or followed by a period,
-or certain punctuation characters, or any sequence of these
-intermingled with whitespace. In particular, it matches a sequence of
-whitespace, possibly empty.
+The default value matches whitespace with certain punctuation
+characters intermingled.
@end defopt
@defopt adaptive-fill-first-line-regexp