|Regular Expression||Will match...|
|foo||The string "foo"|
|^foo||"foo" at the start of a string|
|foo$||"foo" at the end of a string|
This function lets you search for a value in any level of an multiple array. One advantage is that it breaks the search when it finds the value.
This function traverse an multidimensional array recursively. You know the key and what level.