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<?php $s = "\xC2\xA0 \t\r\n\xC2\xA0éhé\xC2\xA0 \t\r\n\xC2\xA0"; var_dump(preg_replace('/^\s+|\s+$/u', '', $s)); var_dump(preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$/u', '', $s));
Output for 5.3.4 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(5) "éhé" string(5) "éhé"
Output for 4.4.0 - 4.4.9, 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.3
string(21) "   éhé   " string(5) "éhé"
Output for 4.3.11, 5.0.0 - 5.0.4
string(21) "   éhé   " Warning: preg_replace(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 3 in /in/hNMWv on line 4 NULL
Output for 4.3.0 - 4.3.10
string(21) "   éhé   " Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 3 in /in/hNMWv on line 4 NULL
preferences:
285.87 ms | 401 KiB | 401 Q