How Can I Effectively Filter Profanity While Avoiding Circumvention Techniques?

Finding Profanity and Circumventing Detection

Despite the misconception that profanity filters are ineffective, there are techniques to minimize their impact. However, it's crucial to approach this task with caution.

Obtaining Profanity Lists

• Dansguardian: Open-source project with default profanity lists and an optional third-party phrase list.

Detection Methods

For simple word filters, there are two primary approaches:

• Regular Expressions: Create a long regex with all prohibited phrases and match or replace them in the input string.
• PHP Filtering Class: Implement a generic class that obscures the center letters of censored words.

Handling Tricky Circumventions

• Spelling Variations: Regex options such as $filterRegex = "(boogers|snot|poop|shucks|argh)"i" can capture words regardless of their spelling.
• Exploiting Character Substitutions: To prevent this, expand the list of banned words to include common character substitutions, such as "455" for "ass."

Additional Resources

• 458 Word List: Zipped file containing 458 common profanities.
• PHP SQL-Based Filtering Approach: Use SQL to detect filtered words.

Remember, while implementing a profanity filter can help mitigate inappropriate content, it's essential to supplement it with human review and accountability mechanisms to combat determined trolls.

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