Regular expression needed to read in between the parenthesis

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Hi Everyone,

I am new to regular expressions. I need a regular expression to read the values between two parenthesis. Basically the regular expression should fetch the operands from a logical expressions.

For example:

INPUT :

1. ((infx.Length != i) && (ch = infx[i++]) != '\0')
2. (infx.Length != i && infx[i++]) != '\0')

OUTPUT :

1. infx.Length != i
ch = infx[i++]) != '\0'

2. infx.Length != i
infx[i++]) != '\0'

Thanks in Advance

Posted 18-Feb-14 19:39pm

sourabhmehta

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s#@!k 19-Feb-14 2:00am

your question is not clear, you can improve your question and provide some code what you have tried.

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OriginalGriff · Answer 1 · 2014-02-18T20:45:00

To be honest, a regex is a poor way to do this: regular expressions are very good at pattern matching, but they are very poor are syntactic analysis, which is what this task requires.

It is possible to match brackets and so forth - though it is quite complex - but it can't easily spot things like this:

(ch = infx[i++]) != ')')

I would look at tokenising the expression, and using that for your evaluation.

Peter Leow · Answer 2 · 2014-02-18T21:44:00

There should be three parts in the output, the third one should be

!= '\0'

Anyway, regular expression is not for everything, try the following approach:

C#

string originalString = @"((infx.Length != i) && (ch = infx[i++]) != '\0')";
Console.WriteLine("The original string is {0}", originalString);
// more separators can be added here
char[] charSeparators = new char[] {'(', '&', ')'};
string[] result = originalString.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
foreach (string s in result)
{
    if (s != " ") //ignore white space
    {
        Console.Write("{0} \n",  s);
    }
}

Regular expression needed to read in between the parenthesis

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