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Regular expression test.

Checks if an input element’s value matches a regular expression. There is an optional negate argument to validate only when the regular expression does not match.

For example, to test a dutch postal code:

<input type="text" id="postcode" name="postcode" value="" />
{% validate id="postcode" type={format pattern="^[0-9][0-9][0-9][0-9] +[A-Za-z][A-Z][a-z]$"} %}

Another example, no digits allowed:

<input type="text" id="nodigit" name="nodigit" value="" />
{% validate id="nodigit" type={format pattern="[0-9]" negate} %}


Argument Description Example
pattern The regular expression to match against. pattern="[0-9][a-z]+"
negate Specify negate when you want to accept values that do not match the pattern. negate
failure_message Message to show when the input value does not match the pattern (or does match the pattern when the negate argument is given). Defaults to "Not valid." failure_message="Invalid postcode"
.. seealso:: :ref:`guide-validators`