URL-friendly options

This module enforces that all option list fields have keys that are composed only of alpha-numeric characters and hyphens.

For example the list below is a valid list:

first-value|First value
second-value|Second value

While this list isn't allowed:

first_value|First value
second value!|Second value!

This means that if you end up needing to use this field as a contextual filter in a view, the keys are already URL-friendly.

Notes

1) This module will not change existing values. However, it won't be possible to add new values to the list if there are non-compliant pre-existing keys, since the form won't validate. A status report message will display an error if there are any keys that fail validation.

2) If there are exceptions that need to bypass this module's validation, developers can implement hook_url_friendly_options_bypass_field_validation() and mark a particular field to be skipped.