Download - The Bastards Book of Regular Expressions

Laziness and greediness 102Replace "Hello"Result:When the sheep says “Hello”, the cow will reply, “Hello”Note: Just a reminder: when we use the text-editor’s Replace-All, as opposed to just a singleReplace action, it’s the text editor that continues looking for matching pattern, not the regex engine.The regex engine is revved up twice to match both instances of the pattern. If we didn’t use ReplaceAll, the resulting text would be:When the sheep says “Hello”, the cow will reply, “Baa! Baa!”Exercise: HTML to Markdown anchorsThe Markdown language is a popular, alternative way to write HTML. It’s not important to knowHTML or Markdown for this exercise; all you need to know is what an anchor link looks like in bothsyntaxes:In HTML:Some linkIn Markdown, that same link is:[Some link](http://example.com)Markdown is popular because it’s easier to read and write – in fact, this whole book is written inMarkdown. However, web browsers don’t interpret Markdown. Usually web developers write inMarkdown and use a separate utility to transfer it to HTML (and back).So, given:Today, I built a website which is nowlisted on various search engines.Write a regex to change it to Markdown syntax:Today, I built a [website](http://example.com) which is now listed [onvarious search engines](http://www.google.com)