Unicode and Multibyte Character Handling in MySQL REGEXP
MySQL 8.0 uses the ICU regex library, which provides full Unicode support. This means REGEXP can correctly interpret multibyte characters in UTF-8, UTF-16, and other Unicode encodings.
Full Unicode Awareness: Characters outside the ASCII range (e.g., emoji, accented letters, Indian languages) are treated as single logical characters.
UTF-8 Support: MySQL’s utf8mb4 encoding allows matching multibyte characters without corruption.
Unicode Character Classes: You can use classes like
\p{L}(letters),\p{N}(numbers),\p{Emoji}(emoji), etc.Case Folding: Case-insensitive matching works for Unicode letters using
REGEXP 'pattern' COLLATE utf8mb4_0900_ai_ci'.No Need for Byte-Level Handling: Patterns operate on characters, not byte sequences.
Use utf8mb4, not utf8: The older 'utf8' charset in MySQL cannot store all Unicode characters (e.g., emoji).
REGEXP_LIKE(), REGEXP_REPLACE(), REGEXP_INSTR() all behave consistently with Unicode rules.
Multibyte characters do not break regex length calculations.