Finding digits with regex using Yahoo Pipes

The regex module allows you to modify, remove or add any text or images to your RSS feed.

In this tutorial I will demonstrate my methods of tackling regex code.
I do not come from a programming background and found regex a huge challenge. My methods are not efficient so if your looking for efficiency look elsewhere .

1. Load up http://gskinner.com/RegExr/
   This is my favorite regex tester. There are others about.

 

In this example I am going to extract the digits from a link.
Images/Icons/Category/48.gif
I want to cut this link to only say ‘48’

 

1. Enter the text you want editing to the body of the regex tester.


2. You want to start at the beginning of the line. The regex for this is ‘^’


3. You then want to remove all the text up until the digits you are after.
   The regex for this is .+

Now you have the entire line highlighted (this is effectively deleting the entire line)

1. Now you want to select the digits. The regex for this is ‘d’
   Because there are two digits you need a ‘+’. The ‘+’ Takes the next character in the line.

We now have the correct amount of the line highlighted.

1. Put a brackets around the digit part of the regex. In this case it would look like this,    ^.+(d)
   The brackets here are making the digits an output variable which can be extracted.


2. Now add a ‘.+’ which highlights (deletes) the rest of the line.Finished regex
   ^.+(d)).+


3. In the regex module put a ‘$1’ to tell the module to output the digit.