How to create Regex to validate logical AND OR operators in string

Asked Apr 09 '19 at 12:24

Active Apr 09 '19 at 12:48

Viewed 47 times

I want to create a Regex expression to validate logical AND OR string combonation and its corresponding opening and closing () brackets. i am using C#

string validator = @"^(?=^[^()]*(?>[^()]+|\((?<DEPTH>)|\)(?<-DEPTH>))*(?(DEPTH)(?!))[^()]*$)[(]*[0-9a-zA-Z]+[)]*(\s+(AND|OR)\s+[(]*[0-9a-zA-Z]+[)]*)*$";

when i tried with below cases its working
(xyz AND abcd)
((abc AND jkr) AND (3 OR 4))

but when i tried with below cases its not working
(xyz AND abcd efg)
((abc AND jkr) AND (3 OR 4 abcd))

edited Apr 09 '19 at 12:48

asked Apr 09 '19 at 12:24

Brendan Croos

Why? What are you ultimately trying to do? – Maximilian Burszley Apr 09 '19 at 12:31
I tried to validate long string query – Brendan Croos Apr 09 '19 at 12:33
What do you mean when you said it is not working. Is it considering the expression as valid or not ? – Sarath Sadasivan Pillai Apr 09 '19 at 12:41
Recursion (?R) is not supported in .NET for regex so you can not soley depend on regex to solve this problem. – Sarath Sadasivan Pillai Apr 09 '19 at 12:44

How to create Regex to validate logical AND OR operators in string

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