<?php

$log = <<<FIM
##################################################
----------------------------------------
Nome: nome_user,
Email: email@user.com,
-------------------------------
,
----------------------------------------
##################################################
FIM;
	
	$start = 'Email:';
	$end = ',';

	$pos1 = strpos( $log, $start );
	$pos2 = strpos( $log, $end, $pos1 );
	$block = trim( substr(
		$log, $pos1 + strlen( $start ),
		$pos2 - $pos1 - strlen( $start )
	) );

	echo $block;