Transact-SQL Syntax Conventions Syntax - Syntax for SQL Server and Azure SQL Database If any one of the arguments isn't of character string data type, the SQL Server Database Engine converts it to character string data type, if it's possible. Using wildcard characters makes the LIKE operator more flexible than using the = and != string comparison operators. However, wildcard characters can be matched with arbitrary fragments of the character string. During pattern matching, regular characters must exactly match the characters specified in the character string. A pattern can include regular characters and wildcard characters. REGEXP is a synonym for REGEXP_LIKE(), so you can use the examples interchangeably.Īlso see Regular Expression Syntax from the MySQL documentation.Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)ĭetermines whether a specific character string matches a specified pattern. You can see more examples of basic regular expressions at MySQL REGEXP Examples. Only the newline character is recognized as a line ending by the. The default behavior is to match line terminators only at the start and end of the string expression. Recognize line terminators within the string.
The match_type argument can contain the following characters: c Case sensitive matching. REGEXP_LIKE('Cat', '^ca', 'i') 'Case-Insensitive' Here’s an example of specifying a case-sensitive match and a case-insensitive match: SELECT This allows you to specify things like whether or not the match is case-sensitive, whether or not to include line terminators, etc. You can provide an additional argument to determine the match type.
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Here’s the full table: SELECT AlbumId, AlbumName This function can be used in the WHERE clause of database queries to return only those rows that contain the pattern: SELECT AlbumId, AlbumName Here’s an example where the regular expression specifies that the string must begin with certain characters: SELECT REGEXP_LIKE('Cat', '^Ca') Result Īnd here’s what happens if there’s no match: SELECT REGEXP_LIKE('Cat', '^Da') Result Example 3 – Match the Beginning of a String Our input string doesn’t contain this character and so 0 is returned. In this case, our regular expression specifies that there should be one or more b characters in any sequence. Here’s an example where the input string doesn’t match the regular expression: SELECT REGEXP_LIKE('Cat', 'b+') Result The function returns 1 to indicate a match. In this case, our regular expression specifies any character in any sequence, so of course we get a match. Here’s a basic example: SELECT REGEXP_LIKE('Cat', '.*') Result For example, you can use match_type to specify case-sensitive matching or not. The optional match_type argument allows you to refine the regular expression. Where expr is the input string and pat is the regular expression for which you’re testing the string against. The syntax goes like this: REGEXP_LIKE(expr, pat) The function returns 1 if the string matches the regular expression provided, and 0 if it doesn’t. In MySQL, the REGEXP_LIKE() function is used to determine whether or not a string matches a regular expression.
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