A, REGEXP, 'matching mode'
II conventional matching method
, for example:
the SELECT * the FROM User the WHERE username REGEXP, '^ t'
indicates that the query username which the first letter in t start
SELECT * FROM user WHERE username REGEXP ' t $' represent the query username inside t the end of the first letter in a
SELECT * FROM user WHERE username REGEXP ' [ak]' indicates that the query which contains the username letters ak
