“Unknown modifier ‘g’ in…” when using preg_match in PHP?

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There is no modifier g for preg_match. Instead, you have to use the preg_match_all function.

So instead of:

preg_match("/^(\w|\.|-)+?@(\w|-)+?\.\w{2,4}($|\.\w{2,4})$/gim", ....)

use:

preg_match_all("/^(\w|\.|-)+?@(\w|-)+?\.\w{2,4}($|\.\w{2,4})$/im", ....)

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