XPath find if node exists
Using a XPath query how do you find if a node (tag) exists at all? For example if I needed to make sure a website page has the correct basic structure like /html/body and /html/head/title. 6 Answers 6
expression
How to make Regular expression into non-greedy?
I’m using jQuery. I have a string with a block of special characters (begin and end). I want get the text from that special characters block. I used a regular expression object for in-string finding. But how can I tell jQuery to find multiple results when have two special character or more? My HTML: <div … Read more
Combining two expressions (Expression)
I have two expressions of type Expression<Func<T, bool>> and I want to take to OR, AND or NOT of these and get a new expression of the same type Expression<Func<T, bool>> expr1; Expression<Func<T, bool>> expr2; … //how to do this (the code below will obviously not work) Expression<Func<T, bool>> andExpression = expr AND expr2 8 … Read more
What is this smiley-with-beard expression: “”?
I came across the following program, which compiles without errors or even warnings: int main(){ <:]{%>; // smile! } Live example. What does the program do, and what is that smiley-expression? 4 Answers 4
What is the difference between an expression and a statement in Python?
In Python, what is the difference between expressions and statements? 15 Answers 15
Expression Versus Statement
I’m asking with regards to c#, but I assume its the same in most other languages. Does anyone have a good definition of expressions and statements and what the differences are? 21 Answers 21 Expression: Something which evaluates to a value. Example: 1+2/x Statement: A line of code which does something. Example: GOTO 100 In … Read more
What are rvalues, lvalues, xvalues, glvalues, and prvalues?
In C++03, an expression is either an rvalue or an lvalue. In C++11, an expression can be an: rvalue lvalue xvalue glvalue prvalue Two categories have become five categories. What are these new categories of expressions? How do these new categories relate to the existing rvalue and lvalue categories? Are the rvalue and lvalue categories … Read more
Insert Dimensions to complete Expression/ReferenceType
Insert Dimensions to complete Expression/ReferenceType
