Regular Expression Functions : Introduction « Regular Expressions Functions « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Regular Expressions Functions » Introduction 
18. 1. 2. Regular Expression Functions

The regular expression functions available in Oracle Database 10g.

REGEXP_LIKE(x, pattern [, match_option])

Returns true when the source x matches the regular expression pattern.

You can change the default matching using match_option, which may be set to:

  1. 'c', which specifies case sensitive matching (default).
  2. 'i', which specifies case insensitive matching.
  3. 'n', which allows you to use the match-any-character operator.
  4. 'm', which treats x as multiple line.

REGEXP_INSTR(x, pattern [, start [, occurrence [, return_option [, match_option]]]])

Searches for pattern in x and returns the position at which pattern occurs.

You can supply an optional:

  1. start position to begin the search.
  2. occurrence that indicates which occurrence of pattern_exp should be returned.
  3. return_option that indicates what integer to return. 0 specifies the integer to return is the position of the first character in x; non-zero specifies the integer to return is the position of the character in x after the occurrence.
  4. match_option to change the default matching.

REGEXP_REPLACE(x, pattern [, replace_string [, start [, occurrence [, match_option]]]])

Searches x for pattern and replaces it with replace_string.

The other options have the same meaning as those shown earlier.

REGEXP_SUBSTR(x, pattern [, start [, occurrence [, match_option]]])

Returns a substring of x that matches pattern, which begins at the position specified by start.

The other options have the same meaning as those shown earlier.

Quote from:

Oracle Database 10g SQL (Osborne ORACLE Press Series) (Paperback)

# Paperback: 608 pages

# Publisher: McGraw-Hill Osborne Media; 1st edition (February 20, 2004)

# Language: English

# ISBN-10: 0072229810

# ISBN-13: 978-0072229813

18. 1. Introduction
18. 1. 1. Regular Expression Metacharacters
18. 1. 2. Regular Expression Functions
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