It would be nice if we could change the response of the error messages and success messages in forms. For most people, a regex pattern is just gibberish.
Also, this way we can translate it.
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Adding flexibility to validation rules to have markdown and color picker would do the trick
Hey Steven 
Thank you for your input here. While the form doesn't have this availability currently, you are able to customize color and content of a form error message by using a status component.
You can hide the default validation message in the text input's advance settings. You can then pull in a status component which you can set to render based on the value of your textInput's .invalid property. See my example below.
I hope this workaround helps out your use case!