Combating Spam in Drupal Contact Forms with Language Validation

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James Williams, Senior Developer at ComputerMinds, shared insights on combating spam by implementing a validation handler for Drupal contact forms, detailed in a blog post. The approach targets submissions with excessive non-Latin characters, such as Cyrillic script, which were unlikely to be legitimate for the UK-based web agency. 

Using PHP regular expressions, the method assesses the proportion of non-Latin content while ignoring links, HTML tags, whitespace, and punctuation. Messages exceeding a 20% threshold of non-Latin characters are flagged with an error message guiding users to communicate more effectively. This solution significantly reduced spam while maintaining accessibility for genuine inquiries.

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https://www.computerminds.co.uk/articles/block-spam-alphabet

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