REGEXP_SUBSTR()

REGEXP_SUBSTR() is used to return the substring of the string expr that matches the regular expression pattern pat.

Description

REGEXP_SUBSTR() is used to return the substring of the string expr that matches the regular expression pattern pat.

Syntax

> REGEXP_SUBSTR(expr, pat[, pos[, occurrence]])

Explanations

  • expr: This is the original string in which to look for matches.

  • pat: This is a regular expression pattern, the function will look for strings that match this pattern.

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

  • occurrence: Which occurrence of a match to search for. If omitted, the default is 1 (returns the first match).

Examples

mysql> SELECT REGEXP_SUBSTR('1a 2b 3c', '[0-9]a');
+---------------------------------+
| regexp_substr(1a 2b 3c, [0-9]a) |
+---------------------------------+
| 1a                              |
+---------------------------------+
1 row in set (0.00 sec)

mysql> SELECT REGEXP_SUBSTR('Lend for land', '^C') Result;
+--------+
| Result |
+--------+
| NULL   |
+--------+
1 row in set (0.00 sec)