PHP removes the regular expression of the string hyperlink text

The functionality of the following instance is to filter all html tags and replace all text before the h1-h5

The code is as follows:

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For ($ I = 1; $ I <= 5; $ I ++) { $ SQL = "SELECT * FROM 'table name 'where' field 'like'   $ Query = mysql_query ($ SQL) or die (mysql_error ());   If (mysql_num_rows ($ query ))  { While ($ rs = mysql_fetch_array ($ query ))   { // Print_r ($ rs );     $ T = stripslashes ($ rs ['field']); $ Str = nl2br (strip_tags (addslashes (removelink ($ t )))); $ SQL = "update table name set field = '$ str 'Where id =". $ rs ['id'];         If (mysql_query ($ SQL ))    { Echo $ rs ['id']. 'Success <br/> ';    } Else    { Echo mysql_error ();    }    }  } Else  { Echo '. $ SQL.' <br/> 'has been updated ';  } }   Function removelink ($ t) { // $ Str = preg_replace ("/<a [^>] * href = [^>] *> | </[^ a] * a [^>] *>/ I ", "", $ t );   $ Str = preg_replace ("/(? Is )(? <= <H1> ).*? (? = </H1>)/I "," ", $ t ); $ Str = preg_replace ("/(? Is )(? <= <H2> ).*? (? = </H2>)/I "," ", $ str ); $ Str = preg_replace ("/(? Is )(? <= <H3> ).*? (? = </H3>)/I "," ", $ str ); $ Str = preg_replace ("/(? Is )(? <= <H4> ).*? (? = </H4>)/I "," ", $ str ); $ Str = preg_replace ("/(? Is )(? <= <H5> ).*? (? = </H5>)/I "," ", $ str ); Return re_h ($ str ); } Function re_h ($ str) { $ Str = str_replace ('$ Str = str_replace ('$ Str = str_replace ('$ Str = str_replace ('$ Str = str_replace ('$ Str = str_replace ('$ Str = str_replace ('$ Str = str_replace ('$ Str = str_replace ('$ Str = str_replace ('Return $ str; }

The following regular expression is used.

The code is as follows:	Copy code
Preg_replace ("/(? Is )(? <= <H1> ).*? (? = </H1>)/I "," ", $ t );

This is the core code.

For example, if you want to remove the hyperlink content from the text, you need to use a regular expression. For example, you can use $ str = preg_replace ("/<a [^>] * href = [^>] *> | </[^ a] * a [^>] * >/I ", "", $ strhtml); this section is used to implement the requirements. For more solutions, see the following.

1. Delete the hyperlink in the content

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Ereg_replace ('<a ([^>] *)> ([^ <] *) </a> ', '<font color = "red"> \ 2 </font>', $ content ); Ereg_replace ("<a [^>] * >|</a>", "", $ content );

 
2. Remove hyperlinks containing specific words

The code is as follows:	Copy code
$ Find = "this string is my find "; $ String = '<font color = "red"> replaced </font>'; // The content of the hyperlink. Echo ereg_replace ('<a ([^>] *)> ([^ <] *'. $ find. '[^>] *) </a>', '<font color = "red"> \ 2 </font>', $ content );

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