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Regular expression to match an HTML Tag

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This is an regular expression to match an HTML Tag from a given input.

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  1. /^<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)$/   
  2.  
  3. To use this expression follow the code below.
  4.  
  5. //Save the expression in a variable.
  6. $correct_htmltag_format = "/^<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)$/";
  7.  
  8. //some input from a user through a text field or from a server.
  9. $user_input = $_REQUEST['html_tag'];
  10.  
  11. //match the two input's and save it in a variable.
  12. tag_match = preg_match($correct_htmltag_format, $user_input);
  13.  
  14. //Condition goes here.
  15. if(tag_match){
  16.   echo "Correct HTML Tag";
  17. }
  18. else{
  19.    echo "Incorrect HTML Tag";
  20. }

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