Regex Help, Search for function names and return them

Need a regex here that will take a file line by line and output all of the function names. So for example:

    function apples_and_bananas ($params, $arguments) {
       print "hello world of yellow and red";
    }

And return apples_and_bananas

Using regex so that it runs fast when doing line by line string manipula开发者_JAVA技巧tion. Unless there is a better way of doing this. I don't know how to generate regex it is so complicated and I was never taught it, can you also point to a good document to learn? This is for c# in a windows form app.

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According to the page "Constants" @ php.net, the regex should be:
function\s+([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\s*\(

This regex supposed to be correct for almost every language.

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Assuming you're using PHP, and want to use PHP for the code to find function names you can use this code. If you're using a different language the code should be fairly similar. Just need to read the file in, and match it against the regex expression /function\s+(\w*)\s*\(/:

$filename = 'yourfile.php';
$matches = array();
preg_match_all('/function\s+(\w*)\s*\(/', file_get_contents($filename), $matches);
$matches = $matches[1];
// Matches contains array of function names

I've tested this for you.

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The captured string form the regex below should be the function name.

/^function\s+([^\s]+)\s/

You should be able to google for regex tutorials to learn how they work. You can also check out Mastering Regular Expressions.

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This will most likely do everything you need:

/function\s+([^\s\(]+)/

However, if you want to restrict the names of functions to only those acceptable in PHP, you need the longer regex @Dor suggested.