regex match function argument from function declaration

Question

I try to write c# application and try to use regex to match function argument from function declaration. For example, I have

ReturnType Condition_Check(NegativeResponseCode *ErrorCode_pt, uint8 Sid_u8)

FUNC(Std_ReturnType, DiaDcmAdapter_CODE) ProductionMode_Write
        (P2CONST(uint8, AUTOMATIC, RTE_APPL_DATA) p_Data,
        P2VAR(Dcm_NegativeResponseCodeType, AUTOMATIC, RTE_APPL_DATA) ErrorCode)

void DSDL_V(const UBYTE* abc)

I want to match their's argument. Example for first function, it should return ErrorCode_pt and Sid_u8 for second function, it should return p_Data and ErrorCode for third function, it should return abc Not match if function don't have argument

It's easy for us with first function by use below regex

Condition_Check\(\w+\s+\*?(\w+)\s*,\s*\w+\s*(\w+)\s*\)

My test: https://regex101.com/r/thD5bR/1

and get $1 and $2 But for 2nd function and 3rd function to complicated and more over, I don't know how many argument in the function (sometime it's 1 arg, sometime 2 arg...)

Is there any best way to match function argument from function declaration?

lemon · Accepted Answer · 2022-06-12 10:58:18Z

1

You can match your function parameters by imposing two conditions:

(?<=[^,][ *]) - it is preceeded by no commas and either space or star
(?=\)|,) - it is followed by either a closed parenthesis or a comma

Here's the full regex:

(?<=[^,][ *])\w+(?=\)|,)

Check the demo here.

edited Jun 12, 2022 at 10:58

answered Jun 12, 2022 at 10:47

lemon

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