Check if a value is valid according to the given constraints. If -e is specified, the value is retrieved from the environment variable with the given name.

Usage:
ops -validate [-e] [-m | -n | -r <regex>] <value> [<message>]

Options

-e    Retrieve value from the environment variable with the given name.
-h    Print this help message.
-m    Check if the value is a valid email address.
-n    Check if the value is a number.
-r string Check if the value matches the given regular expression.

Examples

Validate with regexp

Validate email

ops -validate -m example@gmail.com

ops -validate -r '^[a-z]+$' abc