I need some help making a regex search-CodePudding

I am working on making a regex to recognize a function for my new programming language's syntax highlighting file for vim. I cannot for the life of me understand how to make it match this though.

it would need to match all functions in an example like this:

int addFive() {

}

addFive()

int addFive()
{
}

int value = addFive ()

addFive(int number)

void sum ( string hello )

etc...

but cannot figure it out.
here is what I managed to figure out: [a-zA-Z]*()$

CodePudding user response：

I don't know the all of the syntax you're trying to match, but something like this might work: [a-zA-Z] ?\s*?$.*?$

[a-zA-Z] ? matches alphabet characters, if you want numbers as well you could do [a-zA-Z0-9] ?
\s*? matches possible whitespace between the function name and the parentheses
$ matches the first parenthesis
.*? matches any characters inside the parentheses
$ matches the last parenthesis

test it out: https://regex101.com/r/L2guif/1

CodePudding user response：

It is possible to use grep to identify text across lines with -z option with -o option.

grep -z -o ")[[:space:]]\ {[^}]*}"

But that is a bad idea.

If the function may contain brackets.

For example:

int funct1 () {
 int 1;
 for (i = 0; i < 3; i  ) {
   print i;
 }
}

The RegExp will match the closing bracket, in internal for-loop bracket.

RegExp cannot include logic.

RegExp difficult to distinguish for-loop or if-condition from a function.

You probably need lexical analyzer like lex to identify the structure of your program.