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Regular expression help: need to strip bookmark tags <a name...

benphp

By benphp
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benphp Regular Member

benphp

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Trying to strip a name tags:

 

<html>
<body>
<h2><a name="_Toc479567961"></a><a name="_Toc473534443"></a><a
name="_Toc473530327"></a><a name="_Toc471122987"></a><a name="_Toc470952538"><span
style='font-variant:small-caps !msorm;text-transform:none !msorm'><span
style='font-variant:normal !important;text-transform:uppercase'>Overview</span></span></a></h2>
<p>
<a name="_Toc471122987"></a>Test
<p>
<a href="test.php">Test2</a>
</body>
</html>

 

But keep a href tags.

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DarkWater Member

DarkWater

Posted
Posted 
<?php
$html = <<<HTML
<html>
<body>
<h2><a name="_Toc479567961"></a><a name="_Toc473534443"></a><a
name="_Toc473530327"></a><a name="_Toc471122987"></a><a name="_Toc470952538"><span
style='font-variant:small-caps !msorm;text-transform:none !msorm'><span
style='font-variant:normal !important;text-transform:uppercase'>Overview</span></span></a></h2>
<p>
<a name="_Toc471122987"></a>Test
<p>
<a href="test.php">Test2</a>
</body>
</html>
HTML;
$html = preg_replace('!<a(.+?)name="[^"]+"[^>]*></a>!is', '', $html);
echo $html;

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benphp Regular Member

benphp

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That works - for that HTML - but I want to put it into a larger function, such as:

 

<?php
    $text = str_replace("θ","<code id=\"symb\">θ</code>",$text);
    $text = str_replace("δ","<code id=\"symb\">δ</code>",$text);
    $text = str_replace("º","<code id=\"symb\">°</code>",$text);
    $text = str_replace("°","<code id=\"symb\">°</code>",$text);

    $text = preg_replace('!<a(.+?)name="[^"]+"[^>]*></a>!is', '', $text);
?>

 

and it doesn't work...?

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benphp Regular Member

benphp

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$text = the HTML I posted, for example. In reality it would be a much larger HTML page.

 

<html>
<body>
<h2><a name="_Toc479567961"></a><a name="_Toc473534443"></a><a
name="_Toc473530327"></a><a name="_Toc471122987"></a><a name="_Toc470952538"><span
style='font-variant:small-caps !msorm;text-transform:none !msorm'><span
style='font-variant:normal !important;text-transform:uppercase'>Overview</span></span></a></h2>
<p>
<a name="_Toc471122987"></a>Test
<p>
<a href="test.php">Test2</a>
</body>
</html>

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benphp Regular Member

benphp

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Here's the entire script:

 

<?php
/*	MS Word HTML cleaner,
*/
function lego_clean($text) {

    // normalize white space
    $text = eregi_replace("[[:space:]]+", " ", $text);
    $text = str_replace("> <",">\r\r<",$text);
    $text = str_replace("<br>","<br>\r",$text);
///mine
    $text = str_replace("Symbol\'>w</span>","Symbol\'><code id=\"symb\">ω</code></span>",$text);
    $text = str_replace("Symbol\'>p</span>","Symbol\'><code id=\"symb\">π</code></span>",$text);
    $text = str_replace("Symbol\'>Ð</span>","Symbol\'><code id=\"symb\">∠</code></span>",$text);
    $text = str_replace("Symbol\'>q</span>","Symbol\'><code id=\"symb\">θ</code></span>",$text);
    $text = str_replace("Symbol\'>d</span>","Symbol\'><code id=\"symb\">δ</code></span>",$text);
    $text = str_replace("uppercase\'>d</span>","uppercase\'><code id=\"symb\">Δ</code></span>",$text);
    $text = str_replace("Symbol\'>°</span>","Symbol\'><code id=\"symb\">°</code></span>",$text);
    $text = str_replace("Symbol\'>W</span>","Symbol\'><code id=\"symb\">Ω</code></span>",$text);
    $text = str_replace("&#952;","<code id=\"symb\">θ</code>",$text);
    $text = str_replace("&#948;","<code id=\"symb\">δ</code>",$text);
    $text = str_replace("º","<code id=\"symb\">°</code>",$text);
    $text = str_replace("°","<code id=\"symb\">°</code>",$text);

$text = preg_replace('!<a(.+?)name="[^"]+"[^>]*></a>!is', '', $text);
//reference
/// http://tlt.its.psu.edu/suggestions/international/bylanguage/mathchart.html

    // remove everything before <body>
    $text = strstr($text,"<body");

    // keep tags, strip attributes
    $text = ereg_replace("<p [^>]*BodyTextIndent[^>]*>([^\n|\n\015|\015\n]*)</p>","<p>\\1</p>",$text);
    $text = eregi_replace("<p [^>]*margin-left[^>]*>([^\n|\n\015|\015\n]*)</p>","<blockquote>\\1</blockquote>",$text);
    $text = str_replace(" ","",$text);

    //clean up whatever is left inside <p> and <li>
    $text = eregi_replace("<p [^>]*>","<p>",$text);
    $text = eregi_replace("<li [^>]*>","<li>",$text);

    // kill unwanted tags
    $text = eregi_replace("</?span[^>]*>","",$text);
    $text = eregi_replace("</?body[^>]*>","",$text);
    $text = eregi_replace("</?div[^>]*>","",$text);
    $text = eregi_replace("<\![^>]*>","",$text);
    $text = eregi_replace("</?[a-z]\:[^>]*>","",$text);

    // kill style and on mouse* tags
    $text = eregi_replace("([ \f\r\t\n\'\"])style=[^>]+", "\\1", $text);
    $text = eregi_replace("([ \f\r\t\n\'\"])on[a-z]+=[^>]+", "\\1", $text);

    //remove empty paragraphs
$text = str_replace("<p></p>","",$text);

    //remove closing </html>
$text = str_replace("</html>","",$text);

    //clean up white space again
$text = eregi_replace("[[:space:]]+", " ", $text);
$text = str_replace("> <",">\r\r<",$text);
$text = str_replace("<br>","<br>\r",$text);

return $text;
}




print "<form action=cleaner.php method=post>";
print "<textarea name=text cols=66 rows=25></textarea>";
print "<input type=submit name=btnClean>";
print "</form>";

if (isset($_POST['btnClean'])) {
$text = $_POST['text'];
$text = lego_clean($text);
print $text;
}

?>

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ghostdog74 Newbie

ghostdog74

Posted
Posted

while i am not exactly sure what you are doing, why don't you strip your html code down to <a> tags using strip_tags

$file="file";
$data= strip_tags( file_get_contents($file) , "<a>");
echo $data;
....
..

from there, you can construct simpler regex.( or don't need to)... Otherwise, you might want to consider using a dedicated HTML parser.

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benphp Regular Member

benphp

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When I put Darkwater's line into the larger function it doesn't work. Here's the full script with demo HTML:

 

<html>
<head></head>
<body>
<?php
$text1 = "<html>
<body>
<h2><a name=\"_Toc479567961\"></a><a name=\"_Toc473534443\"></a><a
name=\"_Toc473530327\"></a><a name=\"_Toc471122987\"></a><a name=\"_Toc470952538\"><span
style='font-variant:small-caps !msorm;text-transform:none !msorm'><span
style='font-variant:normal !important;text-transform:uppercase'>Overview</span></span></a></h2>
<p>
<a name=\"_Toc471122987\"></a>Test
</body>
</html>";


/*   MS Word HTML cleaner,
*/
function lego_clean($text) {
// normalize white space
$text = eregi_replace("[[:space:]]+", " ", $text);
$text = str_replace("> <",">\r\r<",$text);
$text = str_replace("<br>","<br>\r",$text);
///mine
$text = str_replace("Symbol\'>w</span>","Symbol\'><code id=\"symb\">ω</code></span>",$text);
$text = str_replace("Symbol\'>p</span>","Symbol\'><code id=\"symb\">π</code></span>",$text);
$text = str_replace("Symbol\'>Ð</span>","Symbol\'><code id=\"symb\">∠</code></span>",$text);
$text = str_replace("Symbol\'>q</span>","Symbol\'><code id=\"symb\">θ</code></span>",$text);
$text = str_replace("Symbol\'>d</span>","Symbol\'><code id=\"symb\">δ</code></span>",$text);
$text = str_replace("uppercase\'>d</span>","uppercase\'><code id=\"symb\">Δ</code></span>",$text);
$text = str_replace("Symbol\'>°</span>","Symbol\'><code id=\"symb\">°</code></span>",$text);
$text = str_replace("Symbol\'>W</span>","Symbol\'><code id=\"symb\">Ω</code></span>",$text);
$text = str_replace("&#38;#952;","<code id=\"symb\">θ</code>",$text);
$text = str_replace("&#38;#948;","<code id=\"symb\">δ</code>",$text);
$text = str_replace("º","<code id=\"symb\">°</code>",$text);
$text = str_replace("°","<code id=\"symb\">°</code>",$text);

$text = preg_replace('!<a(.+?)name="[^"]+"[^>]*></a>!is', '', $text);
//reference
/// http://tlt.its.psu.edu/suggestions/international/bylanguage/mathchart.html

// remove everything before <body>
$text = strstr($text,"<body");

// keep tags, strip attributes
$text = ereg_replace("<p [^>]*BodyTextIndent[^>]*>([^\n|\n\015|\015\n]*)</p>","<p>\\1</p>",$text);
$text = eregi_replace("<p [^>]*margin-left[^>]*>([^\n|\n\015|\015\n]*)</p>","<blockquote>\\1</blockquote>",$text);
$text = str_replace(" ","",$text);

//clean up whatever is left inside <p> and <li>
$text = eregi_replace("<p [^>]*>","<p>",$text);
$text = eregi_replace("<li [^>]*>","<li>",$text);

// kill unwanted tags
$text = eregi_replace("</?span[^>]*>","",$text);
$text = eregi_replace("</?body[^>]*>","",$text);
$text = eregi_replace("</?div[^>]*>","",$text);
$text = eregi_replace("<\![^>]*>","",$text);
$text = eregi_replace("</?[a-z]\:[^>]*>","",$text);

// kill style and on mouse* tags
$text = eregi_replace("([ \f\r\t\n\'\"])style=[^>]+", "\\1", $text);
$text = eregi_replace("([ \f\r\t\n\'\"])on[a-z]+=[^>]+", "\\1", $text);

//remove empty paragraphs
$text = str_replace("<p></p>","",$text);

//remove closing </html>
$text = str_replace("</html>","",$text);

//clean up white space again
$text = eregi_replace("[[:space:]]+", " ", $text);
$text = str_replace("> <",">\r\r<",$text);
$text = str_replace("<br>","<br>\r",$text);

return $text;
}




print "\n<form action=\"cleaner.php\" method=\"post\">";
print "\n<textarea name=\"text1\" cols=\"66\" rows=\"25\">$text1</textarea>";
print "\n<input type=\"submit\" name=\"btnClean\" value=\"Clean\">";
print "\n</form>";

if(isset($_POST['text1'])) {
$text1 = $_POST['text1'];
$text1 = lego_clean($text1);
print "$text1";
}

?>
</body>
</html>

 

Expected result is stripping the <a name tags - including the closing tags, but keeping the <a href tags.

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ghostdog74 Newbie

ghostdog74

Posted
Posted

strip_tags will remove <a href. I want to keep those.

strip_tags will not remove <a href if you pass it paramater "<a>". It will keep all <a> tags.

 

<a name=""> wouldn't be stripped either.

 

at least now its easier to work with as there's no need to construct regex to strip the rest. Sometimes you don't have to use one regex to do

everything. 

$array = split("\n",$haystack);
foreach( $array as $k=>$v){
    if ( strpos( $v,"<a href" ) ){
      echo "Found href\n";
   }
}

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ghostdog74 Newbie

ghostdog74

Posted
Posted

But why think of some crazy solution when a regex works just fine?

its not some crazy solution. Sometimes its called keeping it simple. 

$string = split("<a", strip_tags($string,"<a>") );
foreach ( $string as $k=>$v){
    if( strpos($v,"href")){
        echo "<a $v";
    }
}

why would OP want to create that much regex for stripping unwanted tags when he can use strip_tags?

i am not saying regex are no good, but sometimes its better to do things with less of it.

 

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