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Note: The original guide, linked from the PWA Starter Kit docs provides step-by-step instructions on how to configure "Firebase Hosting + Firebase Functions" to allow deployment of the PWA Starter Kit, using a manual approach. This guide attempts to correct, simplify, and/or update the original by making use of the Firebase CLI.

If you already have some Firebase knowledge, you might want to checkout the Firebase branch on the PWA Starter Kit repo, that already contains the files and folders completed by following the [original guide](https://gist.github.com/Dabolus/314bd939959ebe68f57f1dc

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Copying Data from a Google Sheet into Firebase Realtime Database in real time via Apps Script

If you're trying to do this, you came to the right place!

Watch this code work in real time: https://twitter.com/CodingDoug/status/942576182276497409

See also this gist for copying in the other direction: https://gist.github.com/CodingDoug/ffc4f050cc489a0280eb7f4cbe36af07

Setup

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Perl and PHP Regular Expressions

PHP regexes are based on the PCRE (Perl-Compatible Regular Expressions), so any regexp that works for one should be compatible with the other or any other language that makes use of the PCRE format. Here are some commonly needed regular expressions for both PHP and Perl. Each regex will be in string format and will include delimiters.
All Major Credit Cards

This regular expression will validate all major credit cards: American Express (Amex), Discover, Mastercard, and Visa.

    //All major credit cards regex
    '/^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6011[0-9]{12}|622((12[6-9]|1[3-9][0-9])|([2-8][0-9][0-9])|(9(([0-1][0-9])|(2[0-5]))))[0-9]{10}|64[4-9][0-9]{13}|65[0-9]{14}|3(?:0[0-5]|[68][0-9])[0-9]{11}|3[47][0-9]{13})*$/'

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[void][Windows.Networking.Connectivity.NetworkInformation, Windows, ContentType = WindowsRuntime]
$cost = [Windows.Networking.Connectivity.NetworkInformation]::GetInternetConnectionProfile().GetConnectionCost()
$cost.ApproachingDataLimit -or $cost.OverDataLimit -or $cost.Roaming -or $cost.BackgroundDataUsageRestricted -or ($cost.NetworkCostType -ne "Unrestricted")