Add Regex

[sindresorhus]

• Project Name: Regex
• Project URL: https://github.com/sindresorhus/Regex
• Project Description: This is a wrapper for NSRegularExpression that makes it more convenient and type-safe to use regular expressions in Swift.
• Why it should be added to awesome-swift: None of the existing regex packages are actively maintained anymore. And none of them correctly handles Unicode. For example: Strings containing emojis produce shifted results crossroadlabs/Regex#51
• At least 15 stars (GitHub project)
• Support Swift 5
• Updated contents.json instead of README
• Lib is fully open sourced, written in Swift and not a wrapper over compiled lib
• Description does not say "written in Swift" or variant 🤓

[dkhamsing]

Thx!