Python re module's stuff # 1
When you do something with aws, then you need only ip-address from something like this $ ec2-1-2-3-4.ap-southeast-1.compute.amazonaws.com I used to deal with it like split something then concat with something. Now I just found something cool in python's re module. >>> import re >>> ec2_ip = re.search(r'ec2-(\d+)-(\d+)-(\d+)-(\d+), ).groups() so I get >>> print ec2_ip '1.2.3.4' yaha, love this.