Regular expression - PCRE does not support \L, \l, \N, \P,

PCRE does not support the \uXXXX syntax. Use \x{XXXX} instead. See here.

Your \u2e80-\u9fff range is also equivalent to

\p{InCJK_Radicals_Supplement}\p{InKangxi_Radicals}\p{InIdeographic_Description_Characters}\p{InCJK_Symbols_and_Punctuation}\p{InHiragana}\p{InKatakana}\p{InBopomofo}\p{InHangul_Compatibility_Jamo}\p{InKanbun}\p{InBopomofo_Extended}\p{InKatakana_Phonetic_Extensions}\p{InEnclosed_CJK_Letters_and_Months}\p{InCJK_Compatibility}\p{InCJK_Unified_Ideographs_Extension_A}\p{InYijing_Hexagram_Symbols}\p{InCJK_Unified_Ideographs}

Don't forget to add the u modifier (/regex here/u) if you're dealing with UTF-8. If you're dealing with another multi-byte encoding, you must first convert it to UTF-8.