added some code for integrating TRE into awk

qse/include/qse/awk/awk.h

@@ -1243,7 +1243,8 @@ enum qse_awk_errnum_t
 	QSE_AWK_EOFMTCHR,      /**< invalid character in OFMT */
 
 	/* regular expression error */
-	QSE_AWK_EREXNOCOMP,    /**< no regular expression compiled */
+	QSE_AWK_EREXBL,        /**< failed to build regular expression */
+	QSE_AWK_EREXMA,        /**< failed to match regular expression */
 	QSE_AWK_EREXRECUR,     /**< recursion too deep */
 	QSE_AWK_EREXRPAREN,    /**< a right parenthesis is expected */
 	QSE_AWK_EREXRBRACK,    /**< a right bracket is expected */

qse/include/qse/cmn/tre.h

@@ -79,12 +79,17 @@ enum qse_tre_cflag_t
 	QSE_TRE_RIGHTASSOC  = (1 << 5),
 	QSE_TRE_UNGREEDY    = (1 << 6),
 
+	/* Disable {n,m} occrrence specifier 
+	 * in the QSE_TRE_EXTENDED mode.
+	 * it doesn't affect the BRE's \{\}. */
+	QSE_TRE_NOBOUND     = (1 << 7),
+
 	/* Enable non-standard extensions:
 	 *  - Enable (?:text) for no submatch backreference.
 	 *  - Enable perl-like (?...) extensions like (?i) 
 	 *    if QSE_TRE_EXTENDED is also set.
 	 */
-	QSE_TRE_NONSTDEXT   = (1 << 7) 
+	QSE_TRE_NONSTDEXT   = (1 << 8) 
 };
 
 enum qse_tre_eflag_t