1.
^(25[0-5]|2[0-4]\d|[0-1]\d{2}|\d{2}|\d)(\.(25[0-5]|2[0-4]\d|[0-1]\d{2}|\d{2}|\d)){3}$/gm

2.
^((https?|ftp):\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w\.-]*)\/(.+\.(jpg|gif|png))$/gm

3.
^(?!127|10|192\.168|169\.254|172\.1[6-9]|172\.2\d]|172\.3[0-1])(?:(25[0-5]|2[0-4]\d|[0-1]\d{2}|\d{2}|\d)\.){3}(?:25[0-5]|2[0-4]\d|[0-
1]\d{2}|\d{2}|\d)$/gm

4.
^((https?|ftp):\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w\.-]*).+\.(?!(exe|sh|bat)).{1,4}$/gm