How can I split string with expected parenthesis ?

Question

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I have a string like

C#

string mainstring  =" Daily @f4(@f1(@f3(@f5(P1)))|@f1()) Report @f5()";

Here @f1, @f2, @f3 etc. each of them is a function. I have a list "FunctionList" with all these name of function. Each function return a value and then I will get the complete sentence.

C#

for(int i=0; i<FunctionList.Count;i++)
            {
                if (mainstring.Contains(FunctionList[i]))
                {
                   // Suppose list contains @f1 so it is also in the mainstring. So I want to get this portin "@f1(@f3(@f5(P1)))" I can locate index where @f1 is stared in the string but I don't know how can I get this mainstring with expected closing bracket !  
                }
            }


Please help me to find out the portion from the mainstring with expected closing parenthesis.

Posted 23-Apr-15 0:30am

sachi Dash

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CHill60 23-Apr-15 6:40am

Can you give a better example of what you are trying to do / What you expect to happen in each iteration of the loop

sachi Dash 23-Apr-15 7:09am

It is nothing just function within a function ! I need to find out the function with its closing parenthesis. Each function return a string. At the End of the work mainstring will will replace with the value and it will looke like: Daily consumption Report 02-04-2015" instead of Daily @f4(@f1(@f3(@f5(P1)))|@f1()) Report @f5(). So I need to get the function with exact closing brackets. If I want to get @f5 I need to get @f5(p1)then it will return a value. If I want get @f1 I need to get @f1(@f3(@f5(P1)))that will return a value. After getting the return value of @f1 The string will replace @f1(@f3(@f5(P1))) by this return value.

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CHill60 · Accepted Answer · 2015-04-23T02:02:00

Solution 1

Essentially you are attempting to parse the grammar in the string.

See this CP article Parsing Expression Grammar Support for C# 3.0 Part 1 - PEG Lib and Parser Generator[^] which is also referenced from this post[^] that includes some alternative ideas.

Here's an academic paper[^] on the subject as well.

As you are only really looking for brackets and function names you will hopefully be able to simplify the topic.

Posted 23-Apr-15 2:02am

CHill60

Comments

Sascha Lefèvre 23-Apr-15 8:34am

My 5

Maciej Los 23-Apr-15 8:56am

5ed!

Sergey Alexandrovich Kryukov 29-Apr-15 10:41am

5ed.
—SA