Oracle 9i中的正则表达式

Question

嗨，任何人都可以帮帮我，我的情景是

select to_number(((replace('1*Students', 'Students','60')))) 
  from dual;  

如果我这样使用，则会出现无效号码错误 如何转换为数字，它应显示结果为“60”，请帮帮我，我堆叠。非常感谢提前

Answer 1

select
 to_number( substr ( replace('1*Students', 'Students','60'), 0,instr( replace('1*Students', 'Students','60'), '*' )-1 ),'9999.99')    

 *
 to_number(substr ( replace('1*Students', 'Students','60'), instr(  replace('1*Students', 'Students','60'), '*' )+1 ),'9999.99')

from dual

fiddle demo