returns true if the given string is a data url in the data:[<mediatype>][;base64],<data> format. (this will not test the validity of the Data or Base64 encoding)
data:[<mediatype>][;base64],<data>
the string (url) to be tested
true if the string is a data url
returns true if the given string is a data url in the
data:[<mediatype>][;base64],<data>format. (this will not test the validity of the Data or Base64 encoding)