Update 11-using-arrays-transformations.md

[liamodwyer]

Edited line 70>2 where the part of the regular expression referred to is .* (rather than .\*) and also changed the wording very slightly in the same sentence to make it a little clearer.

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[ostephens]

Thanks for this @liamodwyer - looks great. One comment - if you are fixing a specific issue, it's always useful to reference that in the pull request as it makes sure we close the issue (in this case #102) after accepting the pull request.

But great job - thanks again