正则表达式匹配方程式字符串

Question

Hi I'm trying to make a regex for matching simple math equations strings such as:

565+9^4/22*5

I want to only allow to following arthemithic operators: + , - , * , / , ^ , %

and the equation has no set length, it can be as long as it the user wants it to be.

I tried using something like:

\\d+[+\\-*\\/^%]\\d+

That matches for example:

2*3+3+3

But it doesn't match:

2*3+3

Answer 1

You need to repeat matches for a "number and operator" combination. So you are looking for:

(\d+[+\-*\/^%])*(\d+)