<?php
 
$str="Apelido: Fulano de Tal";
 
	//retira os termos indesejados
	$patterns = array();
	$patterns[0] = '/Apelido/';
	$patterns[1] = '/:/';
	$replacements = array();
	$replacements[1] = '';
	$replacements[0] = '';
	$str = preg_replace($patterns, $replacements, $str);
 
	//substitui quebras de linha (\n), "retornos de carro" (\r) ou tabulações (\t), por um espaço
	$str = preg_replace('/[\n\r\t]/', ' ', $str);
 
	//remove qualquer espaço em branco duplicado
	$str = preg_replace('/\s(?=\s)/', '', $str);
 
	//Retira espaço no ínicio e final
	$str = trim($str);
 
 
echo $str;

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