Regular Expression with (?: exp), can't init DPLRegularExpression

[ruoyuruoshui]

app[-]*[a-zA-Z]*.(?:nextev|nio).com/content/:contentId

This is my regular expression for march url, but after method stringByRemovingNamedGroupsFromString , it's modifiedStr is ^app[-]*[a-zA-Z]*.(?|nio).com/content/([^/]+)$.

[chrismaddern]

Hi @ruoyuruoshui -- ? is a reserved character in regex so your regex is invalid (you can always check here -- https://regex101.com/)

You need to escape your ? --> \\?

Hope that helps!

[ruoyuruoshui]

@chrismaddern (?:nextev|nio) is a group that match nextv or nio but not remember the match result. but method namedGroupTokensForString had match ':nextev' and remove it. I had try to modify DPLNamedGroupComponentPattern = @"?<!\\?):[a-zA-Z0-9-_][^/]+" to ignore ?:exp expression , and it works well.