Regex Tester & Validator

Matches the Russian word 'Заполните' (Fill in) followed by one or more lowercase Cyrillic words separated by spaces. Useful for extracting form instructions or labels in Russian documents that begin with this imperative verb. Captures phrases like 'Заполните анкету' or 'Заполните форму заявления'. With multiline flag enabled, it processes each line independently across multi-line text.