I always been a little bugged by the case treatment, but I think I'm the
only one :).
Since I've lived and breathed grep/egrep, I can't untrain myself to think
that the search string "(abc|def):" will match abc: or Abc: or DEF: and so
forth.
If not this, I guess my next choice would be the behavior of emacs'
"search-forward", which is case-insensitive only if the expression contains
only lowercase letters.
But as you've discovered, a trick such as prepending 'X?' works fine.
For those interested in the code, the relevant portion is (from pattern.c):
/* if no uppercase letters are given, do a case-insensitive search */
int mutt_which_case (const char *s)
{
while (*s)
{
if (isalpha (*s) && isupper (*s))
return 0; /* case-sensitive */
s++;
}
return REG_ICASE; /* case-insensitive */
}
Here, REG_ICASE has been set to (something > 0) elsewhere, and is used when
calling regcomp to ignore case.
This function may be the way it is due to performance considerations, since
an uppercase letter causes an immediate return.
