to the regular expression syntax recognized by common Unix utilities
like <B>sed</B> and <B>grep</B>.  This is the default if no flags are
specified.
<P><DT><A NAME="M9"><B>TCL_REG_EXPANDED</B></A><DD>
Compile the regular expression (basic, extended, or advanced) using an
expanded syntax that allows comments and whitespace.  This mode causes
non-backslashed non-bracket-expression white
space and #-to-end-of-line comments to be ignored.
<P><DT><A NAME="M10"><B>TCL_REG_QUOTE</B></A><DD>
Compile a literal stri