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Anmerkung : When working with a replacement pattern where a backreference is immediately followed by another number ( i.e. : placing a literal number immediately after a matched pattern) , you cannot use the familiar \\1 notation for your backreference . \\11 , for example , would confuse preg_replace( ) since it does not know whether you want the \\1 backreference followed by a literal 1 , or the \\11 backreference followed by nothing .
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