expressions clarification

[Pete Houston]

On Wed, Mar 02, 2016 at 02:06:55PM +0000, Dino Edwards wrote:
> I'm trying to figure out what the difference between the following expressions are:
> 
> [qr'.\.(mdb)$'ix => 0]
> [qr'.\.(uue)$'i => 0]
> [qr'^\.(lha)$' => 0]
> 
> Mainly, trying to figure out when you put in "ix", "i" or nothing at all at the end of the expression.

'x' means ignore whitespace and comments
'i' means ignore case

perldoc perlre for the full details:
http://perldoc.perl.org/perlre.html#Modifiers

Pete
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