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add parenthesis in the example to correct precendence

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Original file line number	Diff line number	Diff line change
`@@ -176,7 +176,10 @@ Comparison Operators`
`176`	`176`	To test if a string does not match a regex, use the logical ``not``
`177`	`177`	operator in combination with the ``matches`` operator::
`178`	`178`
`179`		`- $language->evaluate('not "foo" matches "/bar/"'); // returns true`
	`179`	`+ $language->evaluate('not ("foo" matches "/bar/")'); // returns true`
	`180`	`+`
	`181`	+ You must use parenthesis because the unary operator ``not`` has precedence
	`182`	+ over the binary operator ``matches``.
`180`	`183`
`181`	`184`	`Examples::`
`182`	`185`

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