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All amateur radio call signs:
[a-zA-Z0-9]{1,3}[0123456789][a-zA-Z0-9]{0,3}[a-zA-Z]

Non-US call signs:
\b(?!K)(?!k)(?!N)(?!n)(?!W)(?!w)(?!A[A-L])(?!a[a-l])[a-zA-Z0-9][a-zA-Z0-9]?[a-zA-Z0-9]?[0123456789][a-zA-Z0-9][a-zA-Z0-9]?[a-zA-Z0-9]?[a-zA-Z0-9]?\b

US call signs:
[AKNWaknw][a-zA-Z]{0,2}[0123456789][a-zA-Z]{1,3}

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(function ($) {
//based on that nice demo at https://html5demos.com/dnd-upload/
    $.fn.upl = function (options) {

        var tests = {
                filereader: typeof FileReader != 'undefined',
                dnd: 'draggable' in document.createElement('span'),
                formdata: !!window.FormData,
                progress: "upload" in new XMLHttpRequest
            },

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# Laravel queue worker using systemd
# ----------------------------------
#                                   
# /lib/systemd/system/queue-main.service
#                                  
# run this command to enable service:
# systemctl enable queue-main.service

[Unit]                          
Description=Laravel queue worker   

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#!/bin/bash

##
#  File:
#    nginx_modsite
#  Description:
#    Provides a basic script to automate enabling and disabling websites found
#    in the default configuration directories:
#      /etc/nginx/sites-available and /etc/nginx/sites-enabled
#    For easy access to this script, copy it into the directory:

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var querystring=(function (s) {
    if (s === "")return {};var c = {};for (var e = 0; e < s.length; ++e) {
      var f = s[e].split("=");if (f.length !== 2)continue;c[f[0]] = decodeURIComponent(f[1].replace(/\+/g, " "));
    }return c;
})(window.location.search.substr(1).split("&"));

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           /*

                      <a class="btn btn-link" data-checkall=".chst">check all</a>
                      <a class="btn btn-link" data-uncheckall=".chst">uncheck all</a>
            */     
                
                     var changeBoxesEvent = document.createEvent('HTMLEvents');
                changeBoxesEvent.initEvent('change', true, false);
                var t = document.querySelectorAll('[data-uncheckall]');
                if (t) {

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<sql>
CREATE   FUNCTION `alphanum`( str CHAR(255) ) RETURNS char(255) CHARSET utf8
BEGIN 
  DECLARE i, len SMALLINT DEFAULT 1; 
  DECLARE ret CHAR(255) DEFAULT ''; 
  DECLARE c CHAR(1); 
  SET len = CHAR_LENGTH( str ); 
  REPEAT 
    BEGIN 
      SET c = MID( str, i, 1 );