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docs: update explanation of valid_url_strict
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user_guide_src/source/libraries/validation.rst

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@@ -864,10 +864,10 @@ valid_url No Fails if field does not contain (loosely) a
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URL. Includes simple strings that could be
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hostnames, like "codeigniter".
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valid_url_strict Yes Fails if field does not contain a valid URL. valid_url_strict[https]
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Roughly equivalent to a "fail anything that
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would not be a clickable link." You can
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optionally specify a list of valid schemas.
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If not specified, ``http,https`` are valid.
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You can optionally specify a list of valid
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schemas. If not specified, ``http,https``
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are valid. This rule uses
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PHP's ``FILTER_VALIDATE_URL``.
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valid_date No Fails if field does not contain a valid date. valid_date[d/m/Y]
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Accepts an optional parameter to matches
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a date format.

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