var txt='29 Apr 2019 07:25 AM';
var re1='((?:(?:[0-2]?\\d{1})|(?:[3][01]{1})))(?![\\d])'; // Day 1
var re2='(\\s+)'; // White Space 1
var re3='((?:Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|Jun(?:e)?|Jul(?:y)?|Aug(?:ust)?|Sep(?:tember)?|Sept|Oct(?:ober)?|Nov(?:ember)?|Dec(?:ember)?))'; // Month 1
var re4='(\\s+)'; // White Space 2
var re5='((?:(?:[1]{1}\\d{1}\\d{1}\\d{1})|(?:[2]{1}\\d{3})))(?![\\d])'; // Year 1
var re6='(\\s+)'; // White Space 3
var re7='((?:(?:[0-1][0-9])|(?:[2][0-3])|(?:[0-9])):(?:[0-5][0-9])(?::[0-5][0-9])?(?:\\s?(?:am|AM|pm|PM))?)'; // HourMinuteSec 1
var p = new RegExp(re1+re2+re3+re4+re5+re6+re7,["i"]);
console.log('Testing p:', p)
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