A validator that succeeds only if the provided string is blank (i.e.
A validator that succeeds only if the provided string is blank (i.e. empty or whitespace-only). Note that java.lang.String.trim is used to eliminate whitespace.
A validator that succeeds only if the provided string starts with the specified suffix.
A validator that succeeds only if the provided string matches the specified pattern.
A validator that succeeds only if the provided string is not blank (i.e.
A validator that succeeds only if the provided string is not blank (i.e. empty or whitespace-only). Note that java.lang.String.trim is used to eliminate whitespace.
A validator that succeeds only if the provided string starts with the specified prefix.
Combinators that operate specifically on strings.