Javascript Regex Match Only Inside Parenthesis

I have an data.url string. I want to get some data from it with the following regex var filename = data.url.match(/file=(.+)&/gi); All I want is the data inside the parent

Solution 1:

Javascript returns both the whole matched pattern(usually known as group-0) along with the other matched groups. You can use this one:

var filename = /file=(.+)&/gi.exec(data.url).slice(1);

Solution 2:

Use

var filename = data.url.match(/file=([^&]+)/i)[1];

Example:

"file=example.jpg".match(/file=([^&]+)/i)[1] == "example.jpg""file=example.jpg&b=ttt&c=42".match(/file=([^&]+)/i)[1] == "example.jpg""http://example.com/index.php?file=example.jpg&b=ttt&c=42".match(/file=([^&]+)/i)[1] == "example.jpg"

match() returns an array with the first searched group at the second place, i.e. at match(...)[1].

Note: The result of the above code will be a String. If you still want to have a singleton array with your filename as the only element, then you should take the solution of @Sabuj Hassan.