text: Compare two strings considering only alphanumeric characters | C # implementation of the approach ; Function to check alphanumeric equality of both strings ; variable declaration ; Length of first string ; Length of second string ; To check each and every characters of both string ; If the current character of the first string is not an alphanumeric character , increase the pointer i ; If the current character of the second string is not an alphanumeric character , increase the pointer j ; if all alphanumeric characters of both strings are same then return true ; if any alphanumeric characters of both strings are not same then return false ; If current character matched , increase both pointers to check the next character ; If not same , then return false ; Function to print Equal or Unequal if strings are same or not ; check alphanumeric equality of both strings ; if both are alphanumeric equal , print Equal ; otherwise print Unequal ; Driver code
code: using System ; class GFG { static bool CompareAlphanumeric ( char [ ] str1 , char [ ] str2 ) { int i , j ; i = 0 ; j = 0 ; int len1 = str1 . Length ; int len2 = str2 . Length ; while ( i <= len1 && j <= len2 ) { while ( i < len1 && ( ! ( ( str1 [ i ] >= ' a ' && str1 [ i ] <= ' z ' ) || ( str1 [ i ] >= ' A ' && str1 [ i ] <= ' Z ' ) || ( str1 [ i ] >= '0' && str1 [ i ] <= '9' ) ) ) ) { i ++ ; } while ( j < len2 && ( ! ( ( str2 [ j ] >= ' a ' && str2 [ j ] <= ' z ' ) || ( str2 [ j ] >= ' A ' && str2 [ j ] <= ' Z ' ) || ( str2 [ j ] >= '0' && str2 [ j ] <= '9' ) ) ) ) { j ++ ; } if ( i == len1 && j == len2 ) { return true ; } else if ( str1 [ i ] != str2 [ j ] ) { return false ; } else { i ++ ; j ++ ; } } return false ; } static void CompareAlphanumericUtil ( string str1 , string str2 ) { bool res ; res = CompareAlphanumeric ( str1 . ToCharArray ( ) , str2 . ToCharArray ( ) ) ; if ( res == true ) { Console . WriteLine ( " Equal " ) ; } else { Console . WriteLine ( " Unequal " ) ; } } public static void Main ( ) { string str1 , str2 ; str1 = " Ram , ▁ Shyam " ; str2 = " ▁ Ram ▁ - ▁ Shyam . " ; CompareAlphanumericUtil ( str1 , str2 ) ; str1 = " abc123" ; str2 = "123abc " ; CompareAlphanumericUtil ( str1 , str2 ) ; } }