Regular expressions

[Steven D'Aprano]

On Thu, 5 Nov 2015 07:33 pm, Peter Otten wrote:

> Steven D'Aprano wrote:
> 
>> On Wed, 4 Nov 2015 07:57 pm, Peter Otten wrote:
>> 
>>> I tried Tim's example
>>> 
>>> $ seq 5 | grep '1*'
>>> 1
>>> 2
>>> 3
>>> 4
>>> 5
>>> $
>> 
>> I don't understand this. What on earth is grep matching? How does "4"
>> match "1*"?
> 
> Look for zero or more "1".

Doh!

Oh the shame, I knew that. Somehow I tangled myself in a knot, thinking that
it had to be 1 *followed by* zero or more characters. But of course it's
not a glob, it's a regex.




-- 
Steven