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run code in 150+ php & hhvm versions
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<?php var_dump(mb_ereg_match("♥", "I ♥ PHP")); // should return true var_dump(mb_ereg_match("♥", "♥ PHP")); $pattern = "[♥]+"; $replacement = ":)"; var_dump(mb_ereg_replace($pattern,$replacement,"I ♥ PHP"));
Output for 5.0.0 - 5.2.17, 5.6.7 - 5.6.28, 7.0.0 - 7.1.0
bool(false) bool(true) string(8) "I :) PHP"
Output for hhvm-3.12.0
bool(false) bool(false) Warning: mbregex compile err: premature end of char-class in /in/vpqHu on line 6 bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.5.35
bool(false) bool(false) Warning: mb_ereg_replace(): mbregex compile err: premature end of char-class in /in/vpqHu on line 6 bool(false)
Output for 4.3.4 - 4.4.9
Warning: mb_ereg_match(): mbregex compile err: premature end of regular expression in /in/vpqHu on line 2 bool(false) Warning: mb_ereg_match(): mbregex compile err: premature end of regular expression in /in/vpqHu on line 3 bool(false) Warning: mb_ereg_replace(): mbregex compile err: premature end of regular expression in /in/vpqHu on line 6 bool(false)
Output for 4.3.2 - 4.3.3
Fatal error: Call to undefined function: mb_ereg_match() in /in/vpqHu on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: mb_ereg_match() in /in/vpqHu on line 2