@文心快码mysql function regexp_substr does not exist 文心快码 针对你提出的问题“mysql function regexp_substr does not exist”,我将按照提供的tips逐一进行解答: 确认MySQL版本是否支持REGEXP_SUBSTR函数: REGEXP_SUBSTR函数在MySQL 8.0及更高版本中才可用。如果你的MySQL版本低于8.0,那么该函数将不存在。你...
REGEXP_SUBSTR(str,pattern,[position[,occurrence[,match_param[,subexpr]]]) Purpose REGEXP_SUBSTR() searches the str string for the substring that matches the regular expression specified by pattern. The function returns NULL if the substring does not exist. This function supports multi-byte char...
mysql> SHOW CREATE FUNCTION REGEXP_SUBSTR; ERROR 1305 (42000): FUNCTION REGEXP_SUBSTR does not exist # What about SHOW FUNCTION? mysql> SHOW FUNCTION STATUS LIKE '%REGEX%'; Empty set (0.00 sec) # Found in I_S.ROUTINES? mysql> SELECT * FROM INFORMATION_SCHEMA.ROUTINES -> WHERE ROUTINE...
在Postgres中，这样做的方法是在regex上使用g标志，以便它返回所有匹配项，而不仅仅是第一个匹配项。
mysql> SHOW CREATE FUNCTION REGEXP_SUBSTR; ERROR 1305 (42000): FUNCTION REGEXP_SUBSTR does not exist # What about SHOW FUNCTION? mysql> SHOW FUNCTION STATUS LIKE '%REGEX%'; Empty set (0.00 sec) # Found in I_S.ROUTINES? mysql> SELECT * FROM INFORMATION_SCHEMA.ROUTINES -> WHERE ROUTINE...