正则表达式错误？ - 不是删除？

Question

Finally I found my last error in my code but this time it is very confusing... As you can see in the code, the Output should be (Nothing). But I still get Mitgliedschaft Card (Weltweit).

Why isn't it deleting this phrase? - It should only get deleted if the case \b is active.

$deletewords = ["Mitgliedschaft Card (Weltweit)", "(Xbox 360/Xbox One/weltweit)", "Origins", "Guthaben Code - nur DE", "Guthaben Code für EA ORIGIN", "PC - nur DE"];

$myArra = ["Mitgliedschaft Card (Weltweit)", "Guthaben Code - nur DE", "Guthaben Code für EA ORIGIN", "PC - nur DE"];

foreach ($myArra as $string){
    $string = mb_eregi_replace('\b' . implode('|', $deletewords) . '\b', '', $string);
    echo $string;
}

It is confusing that all other words get deleted but Mitgliedschaft Card (Weltweit) is still there...

Answer 1

There're no word boundaries between ) and end of string in Mitgliedschaft Card (Weltweit). A word boundary exists only between a word character and a NON word character.

Moreover, parenthesis are special character in a regex, you have to escape them, here is a way to go using preg_quote:

$deletewords = ["Mitgliedschaft Card (Weltweit)", "(Xbox 360/Xbox One/weltweit)", "Origins", "Guthaben Code - nur DE", "Guthaben Code für EA ORIGIN", "PC - nur DE"];

$myArra = ["Mitgliedschaft Card (Weltweit)", "Guthaben Code - nur DE", "Guthaben Code für EA ORIGIN", "PC - nur DE"];

function quote($x) { return preg_quote($x);}
$deletewords = array_map('quote', $deletewords);
$allwords =  implode('|', $deletewords)
foreach ($myArra as $string) {
    $string = mb_eregi_replace('(?:' . $allwords . ')', '', $string);
    echo $string,"
";
}