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<?php var_dump(mb_eregi_replace('/(nödkåpa)/i', 'heh', 'nödkåpa blabla'));
based on dJnsU
Output for 4.3.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(16) "nödkåpa blabla"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.2 - 4.3.3
Fatal error: Call to undefined function: mb_eregi_replace() in /in/VYNpF on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: mb_eregi_replace() in /in/VYNpF on line 3