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var paragraph = 'p1=222&p3=111';
var regex = '(^|&)p3=([^&]*)(&|$)';
var found = paragraph.match(regex);
console.log(found[2]);
var paragraph = 'p1=222&[p3]=111';
var regex = '(^|&)[p3]=([^&]*)(&|$)';
var found = paragraph.match(regex);
console.log(found[2]);