On 04/29/2019, at 19:42, bruce linde <bli...@5happy.com 
<mailto:bli...@5happy.com>> wrote:
> now you’re just showing off... guess i’m going to have to stare at the docs a 
> bit to make sure i grok that...


Hey Bruce,

(?=    --> Start of Positive Lookahead Assertion (looks ahead for the following 
pattern)
\d     --> Digit Token
{4}    --> 4 of the preceding 
)      --> End of Positive Lookahead Assertion


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Take Care,
Chris

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