Working with regular expressions

In this recipe, we'll build on our original op script show-int.slax, and enhance its functionality so that it can limit the output based on characteristics of the interface. In this case, it will allow the user to specify a regular expression pattern and only interfaces whose description match this pattern will be displayed.

Getting ready

In order to complete this recipe, you'll need access to a JUNOS router running with a basic configuration.

How to do it...

The following are the steps for the recipe:

1. Start with the show-int.slax source code from the previous recipe, but this time use the new filename show-int-regex.slax.
2. Right after the boiler-plate, declare a command-line argument that is to be user provided in order to nominate the regular expression to use:

        param $description=".*";
        var $arguments = {
           <argument> {
           <name> "description";
           <description> "Match subset of interfaces based upon   
...