A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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a shortening of the phrase "regular expression". A regex is typically a sequence of characters that forms a search pattern, mainly for use in pattern matching with strings.
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HA/DR refers to High Availability / Disaster Recovery, which is typically a suite of technologies provided by a database engine vendor with the aim of increasing availability of data stored in the dat…