I have problems with removing special characters. I want to remove all special characters except "( ) / . % - &", because I'm setting that string as a title.
I edited code from the original (look below):
preg_replace('/[^a-zA-Z0-9_ -%][().][\/]/s', '', $String);
But this is not working to remove special characters like: "’s, "“", "â€", among others.
original code: (this works but it removes these characters: "( ) / . % - &")
preg_replace('/[^a-zA-Z0-9_ -]/s', '', $String);
Your dot is matching all characters. Escape it (and the other special characters), like this:
preg_replace('/[^a-zA-Z0-9_ %\[\]\.\(\)%&-]/s', '', $String);
[, ., (, and ) inside a character class.
- at the end of your character class and additional escaping does most times not hurt. The problem of @user453089 is the part _ -% where he created a range from space to %. I also don't understand why it worked at all because he created 3 character classes in a row.
preg_replace('#[^\w()/.%\-&]#',"",$string);
You want str replace, because performance-wise it's much cheaper and still fits your needs!
$title = str_replace( array( '\'', '"', ',' , ';', '<', '>' ), ' ', $rawtitle);
(Unless this is all about security and sql injection, in that case, I'd rather to go with a POSITIVE list of ALLOWED characters... even better, stick with tested, proven routines.)
Btw, since the OP talked about title-setting: I wouldn't replace special chars with nothing, but with a space. A superficious space is less of a problem than two words glued together...
Good try! I think you just have to make a few small changes:
[ and ]) inside the character class (which are also indicated by [ and ])\) itself- is special: if it's between two characters, it means a range, but if it's at the beginning or the end, it means the literal - character.You'll want something like this:
preg_replace('/[^a-zA-Z0-9_%\[().\]\\/-]/s', '', $String);
See http://docs.activestate.com/activeperl/5.10/lib/pods/perlrecharclass.html#special_characters_inside_a_bracketed_character_class if you want to read up further on this topic.
<?php
$string = '`~!@#$%^&^&*()_+{}[]|\/;:"< >,.?-<h1>You .</h1><p> text</p>'."'";
$string=strip_tags($string,"");
$string = preg_replace('/[^A-Za-z0-9\s.\s-]/','',$string);
echo $string = str_replace( array( '-', '.' ), '', $string);
?>
\s in your char class.mysqli_set_charset($con,"utf8");
$title = ' LEVEL – EXTENDED';
$newtitle = preg_replace('/[^(\x20-\x7F)]*/','', $title);
echo $newtitle;
Result : LEVEL EXTENDED
Many Strange Character be removed by applying below the mysql connection code. but in some circumstances of removing this type strange character like †you can use preg_replace above format.
preg_replace('/[^a-zA-Z0-9_ \-()\/%-&]/s', '', $String);
See example.
/**
* nv_get_plaintext()
*
* @param mixed $string
* @return
*/
function nv_get_plaintext( $string, $keep_image = false, $keep_link = false )
{
// Get image tags
if( $keep_image )
{
if( preg_match_all( "/\<img[^\>]*src=\"([^\"]*)\"[^\>]*\>/is", $string, $match ) )
{
foreach( $match[0] as $key => $_m )
{
$textimg = '';
if( strpos( $match[1][$key], 'data:image/png;base64' ) === false )
{
$textimg = " " . $match[1][$key];
}
if( preg_match_all( "/\<img[^\>]*alt=\"([^\"]+)\"[^\>]*\>/is", $_m, $m_alt ) )
{
$textimg .= " " . $m_alt[1][0];
}
$string = str_replace( $_m, $textimg, $string );
}
}
}
// Get link tags
if( $keep_link )
{
if( preg_match_all( "/\<a[^\>]*href=\"([^\"]+)\"[^\>]*\>(.*)\<\/a\>/isU", $string, $match ) )
{
foreach( $match[0] as $key => $_m )
{
$string = str_replace( $_m, $match[1][$key] . " " . $match[2][$key], $string );
}
}
}
$string = str_replace( ' ', ' ', strip_tags( $string ) );
return preg_replace( '/[ ]+/', ' ', $string );
}
’is the result when the character’(U+ 2019) is encoded in UTF-8 (0xE28099) and interpreted with a single-byte character encoding like Windows-1252.preg_replace('/[^a-zA-Z0-9_ -]/s', '', $String);. Thank you!