.startsWith()

Passes when value.startsWith(prefix) is true. Case-sensitive.

Signature

StringValidator<O> startsWith(String prefix, {String? message, MessageBuilder? messageBuilder})

Parameters

Parameter	Type	Meaning
prefix	String	The required prefix. params['prefix'].
message	String?	Replaces the default error message.
messageBuilder	MessageBuilder?	Builds the message from the issue. message wins when both are given. See Message builders.

Issue

Code missingPrefix. Default message: value does not start with "+". value is replaced by the field name when there is one.

Code generation

@StartsWith(s). Put the annotation on the constructor parameter or the field.

Example

Hand-written

final phone = l.string().startsWith('+');

Generated

@StartsWith('+') required String phone, // l.string().startsWith("+").required()

phone.validate(input)+1-1

1. +valid: '+44 20 7946 0958'
2. -invalid: '020 7946 0958'value does not start with "+"