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Checks that the value matches a regular expression.

^ at the start and $ at the end of the pattern match only at the start and the end of the value, the way RFC 9485 (I-Regexp) maps a pattern to regex engines. { like: '^[0-9]{5}$' } rejects "12345\n" and "12345\n<script>". In languages where $ also matches before a trailing newline (Perl, PHP, Python, Ruby and others), implementations use \z or a similar option.

Error codes: WRONG_FORMAT, FORMAT_ERROR

Live example · edit rules or inputOpen in playground

rules

{
    zip: { like: '^[0-9]{5}$' }
}

{
    zip: { like: '^[0-9]{5}$' }
}

input

{
    zip: '1234'
}

{
    zip: '1234'
}

Invaliderrors

{
  "zip": "WRONG_FORMAT"
}

Pass flags as the second element of a list:

{ first_name: { like: ['^[a-z]+$', 'i'] } }

Only the i flag is currently required by the specification.

Experimental

Regular expression syntax differs between languages. Use the subset that every regex engine supports: the syntax of I-Regexp plus ^ at the start and $ at the end of the pattern. Write [0-9] instead of \d, and don't use lookarounds, backreferences or lazy quantifiers. This rule is experimental, as it needs stricter semantics.

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