On Fri, 2018-02-02 at 12:32 -0500, R. G. Newbury wrote:
> > Thanks to all for the quick responses. I *tried* to RTFM but that was
>
> not clear, even on a re-read. I took [0-9]* as multiple instances of
> [0-9] but NOT zero instances..
>From 'man grep':
Repetition
A regular expression may be followed by one of several repetition operators:
? The preceding item is optional and matched at most once.
* The preceding item will be matched zero or more times.
+ The preceding item will be matched one or more times.
{n} The preceding item is matched exactly n times.
{n,} The preceding item is matched n or more times.
{,m} The preceding item is matched at most m times. This is a GNU extension.
{n,m} The preceding item is matched at least n times, but not more than m times.
poc
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