[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XPath expression which checks that all commas are escaped
> On 3 Nov 2017, at 19:22, Dimitre Novatchev <dnovatchev@gmail.com> wrote: > >> not(contains(replace(., '\\,', ''), ',')) > > And, of course: > > not(matches(., '[^\\],')) > I don't think that detects an unescaped comma at the start of the string. Also, Roger didn't state the rule, but I suspect that there must only be one backslash before the comma: if there are two ("\\,") then the comma is not escaped because the "\\" represents a real backslash. In fact the rule is then that the number of backslashes preceding the comma must be an odd number. There may be a more elegant way, but I'd be inclined to do it by first getting rid of all "\\" sequences: not(matches(replace(., '\\\\', ''), '^,|[^\\],')) Michael Kay Saxonica
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