SQL99's regular expressions are a curious It is much like LIKE, except that it interprets the patternĪ regular expression. Returns true or false depending on whether its pattern matches There are also !~~ and !~~* operatorsĮxpressions string SIMILAR TO pattern Insensitive according to the active locale. Special meaning of underscore and percent signs in the The escape mechanism, which makes it impossible to turn off the It's also possible to select no escape character by writing Special to the string literal parser, so you still need two of You can avoid thisīy selecting a different escape character with ESCAPE then backslash is not special to Means writing four backslashes in the query. Writing a pattern that actually matches a literal backslash String literals, so to write a pattern constant that contains aīackslash you must write two backslashes in the query. Note that the backslash already has a special meaning in The default escape character is the backslashīut a different one may be selected by using the ESCAPE clause. Matching other characters, the respective character inĮscape character. To match a literal underscore or percent sign without String, the pattern must therefore start and end with a percent Underscore ( _) in pattern stands for (matches) any singleĬover the entire string. The string itself in that case LIKE acts like the equals operator. Percent signs or underscore, then the pattern only represents (As expected, the NOT LIKE expression returns false if String NOT LIKE pattern Ĭontained in the set of strings represented by pattern.
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