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Regular expression test.<\/p>\n

Checks if an input element’s value matches a regular expression. There is an optional negate<\/code> argument to validate\nonly when the regular expression does not match.<\/p>\n

For example, to test a dutch postal code:<\/p>\n

<input type="text" id="postcode" name="postcode" value="" \/>\n{% validate id="postcode" type={format pattern="^[0-9][0-9][0-9][0-9] +[A-Za-z][A-Z][a-z]$"} %}\n<\/code><\/pre>\n
Another example, no digits allowed:<\/p>\n
<input type="text" id="nodigit" name="nodigit" value="" \/>\n{% validate id="nodigit" type={format pattern="[0-9]" negate} %}\n<\/code><\/pre>\n
Arguments<\/h2>\n
Argument<\/th>Description<\/th>Example<\/th><\/tr><\/thead>
pattern<\/code><\/td>The regular expression to match against.<\/td>pattern="[0-9][a-z]+"<\/code><\/td><\/tr>
negate<\/code><\/td>Specify negate when you want to accept values that do not match the pattern.<\/td>negate<\/code><\/td><\/tr>
failure_message<\/code><\/td>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.”<\/td>failure_message="Invalid postcode"<\/code><\/td><\/tr><\/tbody><\/table>","slug":"format","is_protected":false,"visible_for":0,"tz":"UTC","language":["en"],"doc_source_hash":"06c6329b37b8207ee2477e497df58beed1d2d6d7121e2159dd8c17f810b76a76","is_featured":false,"content_group_id":{"id":2551,"is_a":["meta","content_group"],"name":"content_group_imported_docs","title":"Imported documentation","uri":"https:\/\/zotonic.com\/id\/content_group_imported_docs"},"category_id":{"id":328,"is_a":["meta","category"],"name":"template_validator","title":"Validators","uri":"https:\/\/test.zotonic.com\/id\/328"},"doc_source_path":"apps\/zotonic_mod_base\/src\/validators\/validator_base_format.erl","publication_start":"2023-06-24T08:17:55Z","github_url":"https:\/\/github.com\/zotonic\/zotonic\/blob\/master\/apps\/zotonic_mod_base\/src\/validators\/validator_base_format.erl","pivot_location_lng":null,"doc_source_kind":"validator","name":"doc_template_validator_validator_format","is_unfindable":false,"is_published":true,"pivot_geocode":null,"created":"2020-05-30T05:47:33Z","uri":null,"doc_status":"current","is_dependent":false,"erlang_app":"zotonic_mod_base","publication_end":"9999-06-01T00:00:00Z","modifier_id":{"id":1,"is_a":["person"],"name":"administrator","title":"Site Administrator","uri":"https:\/\/zotonic.com\/id\/1"},"privacy":0,"doc_source_commit":"fcd7360cf6d307f08dac71bede7378e2b4ac72f0\n","erlang_module":"validator_base_format","creator_id":{"id":336,"is_a":["person","robot"],"name":"gitbot","title":"Git","uri":"https:\/\/zotonic.com\/id\/336"},"modified":"2026-10-01T12:53:35Z","title_slug":"format"},"uri":"https:\/\/zotonic.com\/id\/1747","uri_template":"https:\/\/zotonic.com\/id\/:id","websub":{"hub":"https:\/\/zotonic.com\/.zotonic\/websub","topic":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/1747"}},"status":"ok"}