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Test and debug regular expressions with live matching

Generate UUID v4 identifiers

Build and validate cron schedule expressions

Convert between Unix timestamps and dates

Calculate file permission values

Reference for all HTTP status codes

Generate secure random passwords

Generate HTML meta tags for SEO

Preview Open Graph images for social sharing

Generate robots.txt files for search engines

Minify JavaScript code to reduce file size

Minify CSS stylesheets to reduce file size

Convert times between different time zones

Calculate and convert aspect ratios

Convert a simple node-edge list into an ASCII flowchart