In MariaDB, the REGEXP_INSTR() function returns the starting index of a substring that matches the regular expression pattern.
The index starts at 1. If there’s no match, the result is 0.
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How NOT RLIKE Works in MariaDB
In MariaDB, NOT RLIKE is a negation of the RLIKE operator.
In other words, any time the RLIKE operator would return 1, NOT RLIKE will return 0.
How RLIKE Works in MariaDB
In MariaDB, the RLIKE operator is used to determine whether or not a string matches a regular expression. It’s a synonym for REGEXP.
If the string matches the regular expression provided, the result is 1, otherwise it’s 0.
How NOT REGEXP Works in MariaDB
In MariaDB, the NOT REGEXP operator is a negation of the REGEXP operator.
If the string matches the regular expression provided, the result is 0, otherwise it’s 1. This is the opposite result to what the REGEXP would return (when it isn’t prefixed with NOT).
How REGEXP Works in MariaDB
In MariaDB, the REGEXP operator is used to determine whether or not a string matches a regular expression.
If the string matches the regular expression provided, the result is 1, otherwise it’s 0.
How UPDATEXML() Works in MariaDB
In MariaDB, UPDATEXML() is a built-in function that replaces a single portion of a given fragment of XML markup with a new XML fragment, then returns the updated XML.
How WEIGHT_STRING() Works in MariaDB
In MariaDB, WEIGHT_STRING() is a built-in function that returns the weight string for the input string. The return value is a binary string that represents the comparison and sorting value of the string.
How UNCOMPRESSED_LENGTH() Works in MariaDB
In MariaDB, UNCOMPRESSED_LENGTH() is a built-in function that returns the length of a compressed string before it was compressed with the COMPRESS() function.
How COMPRESS() Works in MariaDB
In MariaDB, COMPRESS() is a built-in function that compresses a string and returns the result as a binary string.
The COMPRESS() function requires MariaDB to have been compiled with a compression library such as zlib. If MariaDB hasn’t been compiled with such a compression library, COMPRESS() returns null.
How UNCOMPRESS() Works in MariaDB
In MariaDB, UNCOMPRESS() is a built-in function that uncompresses a string that’s been compressed by the COMPRESS() function.