T-SQL Regular expression | regular expression sql
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A regularexpression isarulewhichdefineshowcharacterscanappearinanexpression.It’sasequenceofcharacterortextwhichdeterminesthesearchpattern.InSQLdatabases,selectingvaluesbasedonregularexpressionsdefinedintheWHEREconditioncanbeveryuseful.Followingareafewusecasesofhowyoucanuseregularexpressions.Itcanbeusedtoidentifythedatathatusesacombinationsuchasacreditordebitcardnumber,anemailaddress,oratelephonenumber.Findspecifictextpatternorapplyafilterontext,numeric,orspecialcharacterdata.Itcanbeusedtopar...
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A regular expression is a rule which defines how characters can appear in an expression. It’s a sequence of character or text which determines the search pattern. In SQL databases, selecting values based on regular expressions defined in the WHERE condition can be very useful. Following are a few use cases of how you can use regular expressions.
It can be used to identify the data that uses a combination such as a credit or debit card number, an email address, or a telephone number. Find specific text pattern or apply a filter on text, numeric, or special character data. It can be used to parse the data in ETL by creating rules for inbound and outbound traffic, finding patterns in code.Unlike MySQL and Oracle, SQL Server database does not support built-in RegEx functions. However, SQL Server offers built-in functions to tackle such complex issues. Examples of such functions are LIKE, PATINDEX, CHARINDEX, SUBSTRING and REPLACE. We can combine these functions with others a...
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