PHP字符串：在“\ end {Figure}”之后删除“ ewline”

I've PHP String of around 4000 chars; if anywhere in this PHP string $input1, $input2 or $input3 is identified, I want to replace same with $output string. In Summary I want to remove " ewline" after "\end{Figure}"

$input1 = "\end{Figure}
ewline";
$input2 = "\end{Figure} 
ewline";
$input3 = "\end{Figure}
ewline "

Required output: 
$output = "\end{Figure}"; 

Can you please suggest how to achieve required output?

Your question is not very clear, but perhaps this is what you are looking for:

$result = preg_replace('~\\\end\{Figure}\K( )?\\
ewline(?(1)| )~', '', $text);

pattern details:

~                # pattern delimiter
\\\              # backslash (must be double escaped inside quotes)
end\{Figure}
\K               # reset the begining of the match
( )?             # optional capturing group n°1
\\
ewline
(?(1)| )         # if capturing group n°1 exists there is nothing else a space 
~