# Match email addresses with optional names
(?P<name>[a-zA-Z0-9._%+-]+)?\s*<(?P<email>[a-zA-Z0-9.-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})>

# Match dates in YYYY-MM-DD or DD/MM/YYYY
(\d{4}-\d{2}-\d{2})|(\d{2}/\d{2}/\d{4})

# Match hexadecimal colors
# e.g., #FFF, #FFFFFF
# Optional leading #
# Case-insensitive
# Flags inline
(?i)#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})

# Match words starting with vowels
\b[aeiouAEIOU]\w*\b

# Match simple URL
https?://(?:www\.)?\w+\.\w+(?:/\S*)?