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<?php $str = '$1.1m Foo £2,2b Bar €99.9'; $lookup = [ 'b' => 'million platinum coins', 'm' => 'million gold coins', '' => 'gold coins', ]; echo preg_replace_callback( '~[$£€](\d+(?:[.,]\d+)?)([bm]?)~iu', function($m) use ($lookup) { return "$m[1] " . $lookup[strtolower($m[2])]; }, $str );

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25.7 ms | 405 KiB | 5 Q