regular expression
åªå«æœ‰æ±‰å—ã€æ•°å—ã€å—æ¯ã€ä¸‹åˆ’线，下划线ä½ç½®ä¸é™
Contains only Chinese characters, numbers, letters, underlined, underscores the open-location
^[a-zA-Z0-9_\u4e00-\u9fa5]+$
June 15, 2008
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