Question

I am trying to create a calculator,where operands are words.It can repeat any number of times.
e.g. EmpName+xyz or EmpName or x+rr+fff.
It should reject such pattern e.g.
EmpName+
I created a regular expression:

 (?m)(?<Operand>^[a-z].*?)(?<Operator>[+*])  

On this output:  
  1) a + b  
  2) ab+dddd  
  3) ab*fffff*ggggg  
  4) dfg+fg4444+fgf4  
  5) xxxxx  
But it only targets 1,2,3,4 and up to only first operator. Output in regex 2.05. 
"Operand: [ab]"  
"Operator:[+]"  
I am using regex builder 2.05 to test my regex.  How i can repeat this pattern any number of times?  Thanks in advance.

Answer 1

This would typically be expressed as

• operand followed by (operator operand) one or more times

that is

• (?m)<Operand>([+*]<Operator>)*

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Yes i need parantheses as well as divide,percentage,minus sign also.

Then I suggest considering using a real parser. The language of balanced parentheses is not regular.