Pairing html tags using c#? -

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trying create html checker using c#, can't figure out how check if 2 html tags correctly paired <body></body>. managed relevant tags dictionary (the closing tags / in front), in order appeared in input. can check opening tags don't close (or vice versa).

but can't figure out how check if pairs of tags overlapping. e.g.

<body><title></body></title>

   |____________|          |______________|

(there many many pairs)

to clarify, question pair matching, not else html, thanks!

if want match pairs of tags (non-paired tags aside), consider following:

  • go left right, enumerating tags;
  • if see opening tag, put in on stack;
  • if see closing tag, check if corresponding opening tag on top of stack; if yes - pop it, otherwise report error;
  • at end, check if stack empty.

let me illustrate idea using brackets instead of tags simplicity. function checks if brackets ()[]{} balanced.

static bool checkstring(string s) {     var stack = new stack<char>();     foreach(char c in s)         if("([{".contains(c))             stack.push(c);         else if(")]}".contains(c))         {             if(stack.count == 0)                 return false;             char d = stack.pop();             if(d == '(' && c != ')' || d == '[' && c != ']' || d == '{' && c != '}')                 return false;         }     return stack.count == 0; }

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