regexp:add maxRegexStringLen configuration option

src/common/src/tglobal.c

@@ -1036,6 +1036,16 @@ static void doInitGlobalConfig(void) {
   cfg.unitType = TAOS_CFG_UTYPE_BYTE;
   taosInitConfigOption(cfg);
 
+  cfg.option = "maxRegexStringLen";
+  cfg.ptr = &tsMaxRegexStringLen;
+  cfg.valType = TAOS_CFG_VTYPE_INT32;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_CLIENT | TSDB_CFG_CTYPE_B_SHOW;
+  cfg.minValue = 0;
+  cfg.maxValue = TSDB_MAX_FIELD_LEN;
+  cfg.ptrLength = 0;
+  cfg.unitType = TAOS_CFG_UTYPE_BYTE;
+  taosInitConfigOption(cfg);
+
   cfg.option = "maxNumOfOrderedRes";
   cfg.ptr = &tsMaxNumOfOrderedResults;
   cfg.valType = TAOS_CFG_VTYPE_INT32;