regExp property
Implementation
static RegExp regExp = RegExp(
"((http|ftp|https)://)(([a-zA-Z0-9\\._-]+\\.[a-zA-Z]{1,3})|([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}))(:[0-9]{1,4})*(/[a-zA-Z0-9\\&%_\\./-~-]*)*(#[a-zA-Z0-9\\&%_\\./-~-]*)?");