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Check if xPath is correct


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If the XPath method (like SimpleXMLElement::xpath or DOMXPath::query) doesn't issue warnings in case of a syntax error, you can just run it and see if it works. Doesn't even have to match anything.


Otherwise... probably need regular expressions, but one that would validate an XPath query would be insane. If you can restrict the query to a limited set of features then that'd help.

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