js convert string to boolean

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var truthExpression = /^(TRUE|True|true|YES|Yes|yes|ON|On|on|1|T|t|Y|y)$/g;
var falsyExpression = /^(FALSE|False|false|NO|No|no|OFF|Off|off|0|F|f|N|n)$/g;

function parseBoolean(text) {
	if (truthExpression.test(text))
      	return true;

  	if (falsyExpression.test(text))
      	return false;
  
  	throw new Error('Incorrect value!');
}

var text = 'true';
var value = parseBoolean(text);

console.log(value);