Hi Wang,
The regular expression does not detect spaces between Chinese and Latin characters.
The following regular expression should detect segments with spaces between Chinese characters but that do not contain Latin characters.
"[\x4E00-\x9FFF\x3400-\x4DBF\x20000-\x2A6DF\x2A700-\x2B73F\x2B740-\x2B81F\x2B820-\x2CEAF\x2CEB0-\x2EBEF\x30000-\x3134F\xF900-\xFAFF\x2F800-\x2FA1F][:space:][\x4E00-\x9FFF\x3400-\x4DBF\x20000-\x2A6DF\x2A700-\x2B73F\x2B740-\x2B81F\x2B820-\x2CEAF\x2CEB0-\x2EBEF\x30000-\x3134F\xF900-\xFAFF\x2F800-\x2FA1F]" - "<[a-z]{2,}>"
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Best regards,
Òscar.