Regular expressions (regex) are extremely useful in extracting information from any text by searching for one or more matches of a specific search pattern. The basic anchors - ^ and $ expression action ^The matches any string that starts with The end$ matches a string that ends with end ^The end$ exact string match (starts and ends with The end) pragmatic matches any string that has the text pragmatic in it   The basic quantifiers — * + ? and...

Recently I had an error with a domain smtp server not recognising port 587.  To begin to test what was happening I wanted to get some key information about the server.  My tool of choice was the dig command.  Using the dig command: dig codebales.comUnderstanding a DNS look up results from Terminal using the dig command.  This command causes dig to look up the A record for the domain name codebales.com or whatever you enter. To do this dig starts by...