Using the tcomb-form-native library with react native - I've set the keyboardType to email-address. How do I add a regex or email validator to the form? Do I have to do it on the submit function (and throw a special error?) or is there a regex validation field I can set using the library?
I noticed that the tcomb-validation https://github.com/gcanti/tcomb-validationlibrary has a RegExp type field - but I don't see any examples of how to use it. The example shown seems to test if a field is a regex pattern, which is a confusing use case, because you would normally want to test a field against a regex pattern, not enter a regex pattern into a field.
You can create your own subtype with RegExp check
const Email = t.refinement(t.String, email => {
const reg = /[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/; //or any other regexp
return reg.test(email);
});
const Person = t.struct({
name: t.String,
email: Email,
});
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