Implement the following options and primaries:

Implement the following options and primaries:

     -E      Interpret regular expressions followed by -regex and -iregex op-
             tions as extended (modern) regular expressions rather than basic
             regular expressions (BRE's).  The re_format(7) manual page fully
             describes both formats.

     -iname pattern
             Like -name, but the match is case insensitive.

     -ipath pattern
             Like -path, but the match is case insensitive.

     -regex pattern
             True if the whole path of the file matches pattern using regular
             expression.  To match a file named ``./foo/xyzzy'', you can use
             the regular expression ``.*/[xyz]*'' or ``.*/foo/.*'', but not
             ``xyzzy'' or ``/foo/''.

     -iregex pattern
             Like -regex, but the match is case insensitive.

These are meant to be compatible with other find(1) implementations
such as GNU's or NetBSD's except regexp library differences.

Reviewed by:	sobomax, dcs, and some other people on -current