regex pattern of URL that an external ID may be extracted. Qualifier "URL match replacement value" can overwrite the default \1. Use non-capturing groups when needed "(?:www)?" English
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    .*(?!>\\)\((?!\?:).*|
    The regular expression must contain at least one matching group. (English)
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    Q21502404 (Deleted Item)
    (?!.+\bwd\b.+).+
    The regular expression should not contain straw "wd" (English)
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    Q21510856 (Deleted Item)
    Q62026391 (Deleted Item)
    If the website title (<title> in HTML) contains text that would be useful as a Wikidata item label, specify a regular expression with this property to extract the relevant text to use as a label. Otherwise, if no text in the website title is useful as a label, specify <no value>. (English)
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    https://regex101.com/?regex=$1
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    ^https?:\/\/(?:www\.wikidata|[a-z]{2,}\.wikipedia)\.org\/wiki\/Special:BookSources\/(\d[\d\-]{15}\d)$
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    ^https?:\/\/(?:www\.)?iata\.org\/en\/publications\/directories\/code-search\/\?airport\.search=([A-Za-z]{3})
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    ^https?:\/\/id\.loc\.gov\/authorities\/(?:(?:name|subject)s\/)?((?:n|nb|nr|no|ns|mp|sh)(?:[4-9][0-9]|00|20[0-2][0-9])[0-9]{6})
    ^(.+) - LC Linked Data Service: Authorities and Vocabularies \| Library of Congress$
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    ^https?:\/\/lccn\.loc\.gov\/((?:n|nb|nr|no|ns|mp|sh)(?:[4-9][0-9]|00|20[0-2][0-9])[0-9]{6})
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