Regular Expressions 101

All the errors detected are listed below, from left to right, as they appear in the pattern.

? Quantifier cannot follow an opening parenthesis

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Regular Expression

(?:(?i)(?:https:|http:)?\/\/)?(?:(?i)(?:www\.youtube\.com\/(?:embed\/|watch\?v=)|youtu\.be\/|youtube\.googleapis\.com\/v\/)(?<YoutubeID>[a-z0-9-_]{11,12})|(?:vimeo\.com\/|player\.vimeo\.com\/video\/)(?<VimeoID>[0-9]+))

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