Learning Regex The Hard Way

I want to do both the Regex & Ruby tutorials in Learning the hard way series. C’mon, Regex is just super useful.

Just installed Python, pip, distribute, and Regetron. (I’ve spent most of my time learning Ruby, no Python before).

It wasn’t so bad using Homebrew and googling for error messages. This guide was helpful for me to setup Homebrew & Rails on OSX, but I’m still using bash.

For Python, I simply ran brew install python3

As Python finished, I got a message that “Distribute has been installed, so easy_install is available.”

Okay, so let’s try easy_install pip

I get unfriendly error messages:

error: can’t create or remove files in install directory

The following error occurred while trying to add or remove files in the
installation directory:

[Errno 13] Permission denied: ‘/Library/Python/2.7/site-packages/test-easy-install-42140.write-test’

The installation directory you specified (via –install-dir, –prefix, or
the distutils default setting) was:


Perhaps your account does not have write access to this directory? If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or “root” account. If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment

For information on other options, you may wish to consult the
documentation at:


Please make the appropriate changes for your system and try again.

After googling to no real obvious answer, I simply ran sudo easy_install pip

It works!

Then for distribute & Regetron, it was the same thing (I had to use sudo). sudo pip install distribute works. I tried to run pip install regetron, but I had to use sudo pip install regetron instead.