Searches the input string for the first occurrence of a regular expression, beginning at the specified starting position and searching only the specified number of characters. Searches the input string for the first occurrence of the specified regular expression, using the specified matching options and time-out interval. In this article Overloads Match(String, String, RegexOptions, TimeSpan) These are matched with the pattern (inside a set).Searches an input string for a substring that matches a regular expression pattern and returns the first occurrence as a single Match object. There are also number of shortcuts to match particular preset character names. Remember that matches are by default case-insensitive, unless a binary string is used, so the following example, specifically looking for an uppercase, counter-intuitively matches a lowercase character: SELECT 'Mari' REGEXP 'Mar]+' The following character classes exist:įor example: SELECT 'Maria' REGEXP 'Mar]*' These are matched with the pattern (inside a set). There are a number of shortcuts to match particular preset character classes.
REGULAR EXPRESSION NOT TO INCLUDE UPGRADE
SELECT 'How do I upgrade MariaDB?' REGEXP ']' | 'How do I upgrade MariaDB?' REGEXP ']' | For example: SELECT 'How do I upgrade MariaDB?' REGEXP ']' The :: patterns match the beginning and the end of a word respectively. The - character can also be matched in the same way: SELECT '-Maria' REGEXP '' Incorrect order, so no match: SELECT ']Maria' REGEXP ']' The characters on their own can be literally matched inside a block, without escaping, as long as they immediately match the opening bracket: SELECT '' The ^ character means does NOT match, for example: SELECT 'Maria' REGEXP 'Maia' The following does not match, as r falls outside of the range a-p. The square brackets also permit a range match, for example, to match any character from a-z, is used. For example, to match either the p or the r character: SELECT 'Maria' REGEXP 'Maia' groups characters for matching purposes. This notation is used to match many instances of the x.
(xyz) - combine a sequence, for example (xyz)+ or (xyz)* SELECT 'Maria' REGEXP '(ari)+' In the examples below, it's the r character. X* matches zero or more of a character x. matches any single character: SELECT 'Maria' REGEXP 'Ma.ia' $ matches the end of a string: SELECT 'Maria' REGEXP 'ia$' ^ matches the beginning of a string (inside square brackets it can also mean NOT - see below): SELECT 'Maria' REGEXP '^Ma' It's the special characters that give regular expressions their power. The above examples introduce the syntax, but are not very useful on their own. For example: SELECT 'Maria' REGEXP 'Monty|Maria' When the order is reversed, the result is false, as the pattern "Maria" does not exist in the expression "Mari"Ī match can be performed against more than one word with the | character.
The first returns true because the pattern "Mari" exists in the expression "Maria".
Note that the word being matched must match the whole pattern: SELECT 'Maria' REGEXP 'Mari' The match is case-insensitive, except in the case of BINARY strings. Without any special characters, a regular expression match is true if the characters match. Also note that until MariaDB 10.0.5, regular expressions were not multi-byte safe, and therefore could produce unexpected results in multi-byte character sets. Comparisons are performed on the byte value, so characters that are treated as equivalent by a collation, but do not have the same byte-value, such as accented characters, could evaluate as unequal.