正则表达式从引号内部使用

Question

This is my current regex attempt:

$input_lines = 'Data1("begin    Data2(hey); end", "hi");';    
preg_match_all("/(.*?)[(](.*?)[)][;]/", $input_lines, $output_array);

I want this regex to get:

"begin    Data2(hey); end", "hi"

On the third array, but it just gets:

"begin    Data2(hey

I want to not get anything inside of these double quotes (not close when we have ); inside of " " ).

Answer 1

Just use a simple regex to match everything( . match anything except new line; * between 0 and more times; Also note it's greedy) between two quotes, eg

$input_lines = 'Data1("begin    Data2(hey); end", "hi");';  
preg_match('/(".*")/', $input_lines, $matches);

print_r($matches);

Answer 2

You could extend your regular expression so that it first checks if there is a double quote immediately after the opening bracket, and if so to require that there is one just before the closing bracket:

$input_lines = "Data1(\"begin    Data2(hey); end\", \"hi\");";    
preg_match_all('/(.*?)[(](".*?"|.*?)[)];/', $input_lines, $output_array);
print_r ($output_array);

Output:

Array
(
[0] => Array (
        [0] => Data1("begin    Data2(hey); end", "hi");
    )
[1] => Array (
        [0] => Data1
    )
[2] => Array (
        [0] => "begin    Data2(hey); end", "hi"
    )
)

Probably you'll want to also have this working with single quotes, so you would add a possibility for that:

$input_lines = "Data1('begin    Data2(hey); end', 'hi');";    
preg_match_all('/(.*?)[(](".*?"|\'.*?\'|.*?)[)];/', $input_lines, $output_array);
print_r ($output_array);

Then, you would also want to deal correctly with escaped quotes inside the input data, so you would extend it to this:

$input_lines = "Data1('begin    Data2(\'hey\'); end', 'hi');";    
preg_match_all('/(.*?)[(](".*?(?:[\\\\]".*?)*"|\'.*?(?:[\\\\]\'.*?)*\'|.*?)[)];/',
               $input_lines, $output_array);
print_r ($output_array);

Output would be:

Array
(
[0] => Array (
        [0] => Data1('begin    Data2(\'hey\'); end', 'hi');
    )
[1] => Array (
        [0] => Data1
    )
[2] => Array (
        [0] => 'begin    Data2(\'hey\'); end', 'hi'
    )
)

Note that this way you will also still match strings that do not contain such quotes, eg

$input_lines = "Data1(mydata);";

Would still match and give expected results.