Merge pull request #7905 from taosdata/hotfix/td-6634

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

src/client/src/tscSQLParser.c

@@ -4399,7 +4399,16 @@ 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 = pattern;
+    pRight->value.nLen = lenPattern;
+
     int cflags = REG_EXTENDED;
     if ((errCode = regcomp(&regex, pattern, cflags)) != 0) {
       regerror(errCode, &regex, regErrBuf, sizeof(regErrBuf));

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;