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/** @private */
getPrefixStart: function(model, end) {
var index = end;
while (index > 0 && /[A-Za-z0-9_=\"]/.test(model.getText(index - 1, index))) {
while (index > 0 && /[A-Za-z0-9_]/.test(model.getText(index - 1, index))) {
index--;
}
return index;