What are some potential approaches to solving the issue of replacing multiple periods in a filename with underscores, except for the last one, in PHP?

The issue of replacing multiple periods in a filename with underscores, except for the last one, can be solved by using regular expressions in PHP. One approach is to match all periods except for the last one and replace them with underscores. This can be achieved by using the preg_replace function in PHP with a regular expression pattern that captures all periods except the last one. 

$filename = "example.file.name.txt";
$fixedFilename = preg_replace('/\.(?=.*\.)/', '_', $filename);
echo $fixedFilename; // Outputs: example_file_name.txt

Keywords

PHP string manipulation preg_replace regular expressions filename manipulation

Related Questions