fixed isValid function - regexp not being used correctly#1

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JB-Walker wants to merge 3 commits intogh-pagesfrom

Commits on Jul 30, 2017

fixed isValid function - regexp not being used correctly
JB-Walker
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Added comments, factored the validity test, replaced last var with let.
JB-Walker
committed
changed the '.slice().pop()' combo method to '.slice(-1)[0]' to be more effecient.
JB-Walker
committed