3v4l.org

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<?php $x = 'Stendes iela k5'; echo preg_replace('/(.*)k(\d+)/', '${1}k-${2}', $x);
Output for 7.4.0 - 7.4.30, 8.0.1 - 8.0.23, 8.1.0 - 8.1.10, 8.2rc1
Stendes iela k-5

preferences:
22.57 ms | 409 KiB | 5 Q