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REGEXP_INSTR()

Description

REGEXP_INSTR() returns the starting position in the string of the matched regular expression pattern. If no match is found, the function returns 0.

Syntax

> REGEXP_INSTR(expr, pat[, pos[, occurrence[, return_option[, match_type]]]])

Explanations

  • expr is the string to match.

  • pat is the regular expression to match in the string.

  • pos: The position in expr at which to start the search. If omitted, the default is 1.

  • occurrence: Which occurrence of a match to replace. If omitted, the default is 0 (which means replace all occurrences).

  • return_option: This is an optional parameter specifying whether the returned position is where the pattern starts or ends. If 0 or omitted, the function returns the position at which the pattern begins. If 1, the function returns the position after the position where the pattern ends.

  • match_type: The optional match_type argument is a string that may contain any or all the following characters specifying how to perform matching:

    • 'c': Case-sensitive matching by default.
    • 'i': Case-insensitive matching.
    • 'n': The . character matches line terminators. The default is for . matching to stop at the end of a line.
    • 'm': Multiple-line mode. Recognize line terminators within the string. The default behavior is to match line terminators only at the start and end of the string expression.
    • 'u': Unix-only line endings. Only the newline character is recognized as a line ending by the ., ^, and $ match operators.

Examples

```SQL mysql> SELECT REGEXP_INSTR('Hello, my number is 12345.', '[0-9]+'); +--------------------------------------------------+ | regexp_instr(Hello, my number is 12345., [0-9]+) | +--------------------------------------------------+ | 21 | +--------------------------------------------------+ 1 row in set (0.00 sec)

mysql> SELECT REGEXP_INSTR('apple', 'z+'); +-------------------------+ | regexp_instr(apple, z+) | +-------------------------+ | 0 | +-------------------------+ 1 row in set (0.00 sec)

mysql> SELECT REGEXP_INSTR('Hello, World!', 'World'); +------------------------------------+ | regexp_instr(Hello, World!, World) | +------------------------------------+ | 8 | +------------------------------------+ 1 row in set (0.00 sec)

mysql> SELECT REGEXP_INSTR('Hello, World! World!', 'World', 1, 2); +-------------------------------------------------+ | regexp_instr(Hello, World! World!, World, 1, 2) | +-------------------------------------------------+ | 15 | +-------------------------------------------------+ 1 row in set (0.00 sec) ```