action=addItem&siteId=4&lang_locale=en_US&country=US&catalogId=1&productId=417689&displaySize=7&skuSize=2194171&qty=1&pil=7&psh=had+AIRJRnjbp7+rGivIKg00

var text = text.replace(/&psh=[^&]*/, "&psh=" + data.psh);

var text = text.replace(/&psh=[^&#]*/, "&psh=" + data.psh);