What potential issues can arise when trying to extract version numbers from file names for caching purposes?

Potential issues that can arise when trying to extract version numbers from file names for caching purposes include inconsistent naming conventions, varying file extensions, and the presence of additional characters in the file names. To solve this issue, you can use regular expressions to extract the version number from the file name by matching a specific pattern that represents the version number. 

$filename = "example_v1.2.3.js";
$version = preg_match('/v(\d+\.\d+\.\d+)/', $filename, $matches) ? $matches[1] : null;

echo $version; // Output: 1.2.3

Keywords

regex version numbers file names caching parsing

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