Validation Muse for Contact Form 7

Validation Muse lets you write your own validation rules and error messages for every Contact Form 7 field — directly in the form editor, per form, per field. No code, no global settings page, no JavaScript hacks.

x introduced Schema-based Validation (SWV). Validation Muse runs its filters at priority 20 (after CF7 core) and uses Reflection to replace SWV error text on already-invalidated fields, so your custom copy actually shows up — even on the new validation engine.

Why Validation Muse

• CF7 6.x SWV compatible — works with the new Schema-based Validation engine, not just legacy hooks.

• Custom Regex & Length Rules — define custom regular expression patterns, min length, and max length rules per field with their own error messages.

• Conditional “Required-If” Rules — make fields required only when a companion field is filled/checked.

• Client-Side SWV Integration — standard validation rules (required, email, length) are injected into CF7’s native SWV engine for instant frontend feedback with full accessibility (A11y) support.

• Rule Sets Import/Export & Templates — export/import validation rules as JSON, copy them from other forms, and bulk apply global templates.

• Placeholder Tokens — use {field_label}, {min}, and {max} in validation messages to generate dynamic texts.

• Per-form, per-field — each form keeps its own messages; no global override.

• Stored in post meta — messages live with the form, compatible with CF7 form duplication and third-party CF7 import/export plugins.

• Multilingual via WPML, Polylang & Flavor — translates rules using standard WPML/Polylang hooks, and features language tabs + one-click AI Translate when Flavor is active.

• Developer-friendly — extensibility hooks vmcf7_loaded and vmcf7_validation_tag_types let you add custom field types.

• Lightweight — no admin bloat, no tracking, no upsells.

Supported field types

• Required-field messages: any required tag ( text, textarea, select, checkbox, radio, file, etc.).

• Invalid-format messages: email, url, tel, number (including range ), date, and time fields.

• Custom error messages on validation failure: file (size/type checks), acceptance (unchecked/unaccepted state), and quiz (incorrect answer).

• HTML inside messages is allowed and sanitized through wp_kses_post().

• Custom Regex and Min/Max Length rules support all input fields (excluding acceptance and quiz).

Translations

pot file and is already translated into German, Spanish, French, Portuguese (Brazil), Russian, and Ukrainian. Help translate it into your language.