I need to extract element from a document in case inner text node contains certain sequence of characters.
Ex: Test ' both " quotes"::LGC

So I used concat operator to join the string :
Value[@Name=\"concat(\"Test ' both \",'\" quotes\"::LGC')\"]"

But still SelectSingleNode operator return E-FAIL.

What I am missing here ?

I'm afraid your code might have come out a bit garbled.

It looks as if you are using XPath within some programming language where you are writing the XPath expression as a string literal in double quotes, and escaping the double quotes using the conventions of that host language. I assume also that you are using XPath 1.0.

Firstly, let's see what the XPath expression should look like:

Then, to put that in a string literal in your host language (if you haven't got some mechanism like C#'s verbatim string literals), you put a backslash before each quotation mark, and put the whole thing in quotes:

__________________
Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer\'s Reference

Thanks Michael all your help & it resolve my issue.

Here is C++ code from Steven Engelhardt :
http://stevenengelhardt.com/tag/c-4/