PHP remove special character from string

Question

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);

Answer 1

preg_replace('#[^\w()/.%\-&]#',"",$string);

Answer 2

<?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);
?>

Answer 3

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 );
}

Answer 4

preg_replace('/[^a-zA-Z0-9_ \-()\/%-&]/s', '', $String);

Answer 5

Good try! I think you just have to make a few small changes:

• Escape the square brackets ([ and ]) inside the character class (which are also indicated by [ and ])
• Escape the escape character (\) itself
• Plus there's a quirk where - 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.

Answer 6

Your dot is matching all characters. Escape it (and the other special characters), like this:

preg_replace('/[^a-zA-Z0-9_ %\[\]\.\(\)%&-]/s', '', $String);