使用或操作创建正则表达式

Question

I want to read file if the following pattern.

Here is file1.text

Abc,192.168.99.4   
Eyo,192.168.8.16,3370    
Opa,4447    
Ctc,192.168.66.2,5507

Here is my code that is working for single, . Var3 is not displaying any value.I am putting or operation between two and three values regular expresion.

    if(EOF == fscanf(mf," %[^,],%s,%s | %[^,], %[^,] %[^,],%s,%s,%s", var1,var2,var3)){
      printf("var2=%s\n",var2);
      printf(" var1=%s\n",var1);
      printf(" var3=%s\n",var3);   
   }

The code is producing output

Var2=Abc

Var1=192.168.99.4

Var3=

Var2=Eyo

Var1=192.168.8.16,3370

Var3=

Var2=Opa

Var1=4447

Var3=

Var2=Ctc

Var1=192.168.66.2,5507

Var3=  

How to split into two comma separated into 3 values?

Answer 1

... Var3 is not displaying any value.I am putting or operation between two and three values regular expresion.

Save time. Enable all compiler warnings to see its trouble of mis-matched specifiers and arguments.

if(EOF == fscanf(mf," %[^,],%s,%s | %[^,], %[^,] %[^,],%s,%s,%s",
    var1,var2,var3)){

---

My question is simple how to read above text file in c using file datatype.??

To read , use fgets() to read a line of the file into a string .

Then parse that string multiple times to find the matching form.

Never scan with "%[...]" or "%s" without a width .

char var1[3 + 1] = { 0 };  // Prefix
int var2[4] = { 0 };       // IP
int var3 = 0;              // Port  

#define IFMT_PRE  " %3[^,]"
#define IFMT_IP   ",%3d .%3d .%3d .%3d"
#define IFMT_PORT " ,%d"
#define OFMT_PRE  "%s"
#define OFMT_IP   ",%d.%d.%d.%d"
#define OFMT_PORT ",%d"

// Use " %n" to detect if scanning completed.

int n = 0;
sscanf(buf, IFMT_PRE IFMT_IP IFMT_PORT " %n",
    var1, &var2[0], &var2[1], &var2[2], &var2[3], &var3, &n);
if (n > 0 && buf[n] == '\0') {
  // Successfully scanned prefix, IP and port.
  printf(OFMT_PRE OFMT_IP OFMT_PORT "\n",
      var1, var2[0], var2[1], var2[2], var2[3], var3);
  return 0;
}

n = 0;
sscanf(buf, IFMT_PRE IFMT_IP " %n",
    var1, &var2[0], &var2[1], &var2[2], &var2[3], &n);
if (n > 0 && buf[n] == '\0') {
  // Successfully scanned prefix and IP.
  printf(OFMT_PRE OFMT_IP "\n",
      var1, var2[0], var2[1], var2[2], var2[3]);
  return 0;
}

n = 0;
sscanf(buf, IFMT_PRE IFMT_PORT " %n",
    var1, &var3, &n);
if (n > 0 && buf[n] == '\0') {
  // Successfully scanned prefix, and port.
  printf(OFMT_PRE OFMT_PORT "\n",
      var1, var3);
  return 0;
}

printf("Failed all 3.\n");