Regular Expressions!

There are now finally regular expressions in Espruino! If you download a cutting edge build then you should get them.

There's:

• /regex/ syntax to define them
  
• Or `new RegExp("regex")
  
• regex.exec to match on a supplied string
  
• string.replace(regex, replacement)
  
• string.split(regex)
  
  

It's not got all the RegEx functionality built in, but should cover most of the common use-cases.

Let me know how it goes! The RegEx system might still need some work, so if you find a RegEx that doesn't seem to be working properly, please let me know!