[TD-6634]<hotfix>:use original string and remove begin/end quote instead of...

[TD-6634]<hotfix>:use original string and remove begin/end quote instead of string value after stringRmQuote

src/client/src/tscSQLParser.c

@@ -4539,13 +4539,24 @@ static int32_t validateMatchExpr(tSqlExpr* pExpr, STableMeta* pTableMeta, int32_
     regex_t regex;
     char    regErrBuf[256] = {0};
 
-    const char* pattern = pRight->value.pz;
+    //remove the quote at the begin end of original sql string.
+    uint32_t lenPattern = pRight->exprToken.n - 2;
+    char* pattern = malloc(lenPattern + 1);
+    strncpy(pattern, pRight->exprToken.z+1, lenPattern);
+    pattern[lenPattern] = '\0';
+
+    tfree(pRight->value.pz);
+    pRight->value.pz = strndup(pattern, lenPattern);
+    pRight->value.nLen = lenPattern;
+
     int cflags = REG_EXTENDED;
     if ((errCode = regcomp(&regex, pattern, cflags)) != 0) {
       regerror(errCode, &regex, regErrBuf, sizeof(regErrBuf));
       tscError("Failed to compile regex pattern %s. reason %s", pattern, regErrBuf);
+      free(pattern);
       return invalidOperationMsg(msgBuf, msg3);
     }
+    free(pattern);
     regfree(&regex);
   }
 

tests/script/general/parser/regex.sim

@@ -79,6 +79,23 @@ if $rows != 1 then
   return -1
 endi  
 
+sql select c1b from $st_name where c1b match '\\.\\*'
+if $rows != 0 then
+  return -1
+endi
+
+sql select c1b from $st_name where c1b match '\\\\'
+if $rows != 0 then
+  return -1
+endi
+
+sql insert into $ct1_name values(now+3s, '\\this is engine')
+
+sql select c1b from $st_name where c1b match '\\'
+if $rows != 1 then
+  return -1
+endi
+
 sql_error select c1b from $st_name where c1b match e;
 sql_error select c1b from $st_name where c1b nmatch e;