1 一个 SQL 语句中的 select_expression 或 where_definition 可由任何使用了下面所描述函数的表达式组成...
match_type: A string that specifies how to perform matching. The meaning is as described for REGEXP_LIKE(). Prior to MySQL 8.0.17, the result returned by this function used the UTF-16 character set; in MySQL 8.0.17 and later, the character set and collation of the expression searched f...
)Code language:SQL (Structured Query Language)(sql) TheREGEXP_INSTR()function evaluates thestringbased on thepatternand returns an integer indicating the beginning or ending position of the matched substring, depending on the value of thereturn_optionargument. If the function does not find any mat...
REGEXP_SUBSTR(source_string, pattern [, start_position [, occurrence [, match_parameter [, subexpr ] ] ] ] ) Code language: SQL (Structured Query Language) (sql) Arguments The Oracle REGEXP_SUBSTR() function accepts 6 arguments: 1) source_string is a string to be searched for. 2) pa...
The REGEXP BINARY operator ensures that the pattern matching is case-sensitive, meaning it will only match names that start with a lowercase 'w' and not an uppercase 'W'. The regular expression pattern '^w' is used to match names starting with 'w', and the BINARY keyword makes the mat...
The default is 1, meaning that Oracle begins the search at the first character of source_char. After finding the first occurrence of pattern, the database searches for a second occurrence beginning with the first character following the first occurrence. match_param is a character expression of...
occurrenceis a positive integer indicating which occurrence ofpatterninsource_charOracle should search for. The default is 1, meaning that Oracle searches for the first occurrence ofpattern. Ifoccurrenceis greater than 1, then the database searches for the second occurrence beginning with the first ch...
Metacharacters are characters with a special meaning:MetacharacterDescriptionTry it \d Find a digit Try it » \s Find a whitespace character Try it » \b Find a match at the beginning of a word like this: \bWORD, or at the end of a word like this: WORD\b Try it » Try it ...
1exec() Executes a search for a match in its string parameter. 2test() Tests for a match in its string parameter. 3toSource() Returns an object literal representing the specified object; you can use this value to create a new object. ...
SQL> SELECT REGEXP_REPLACE('Mississippi', 'si', 'SI', 1, 0, 'i') FROM dual; REGEXP_REPL --- MisSIsSIppi SQL> SELECT REGEXP_REPLACE('lord, llll','l[[:alpha:]]{2}', 'ssss') AS result FROM dual; RESULT --- ssssd, ssssl SQL> Home »Oracle »String ...