Usage of regexplike in oracle

Oracle REGEXP_LIKE operator is used to perform regular expression matching, check whether the string matches the specified pattern, and return a Boolean value. It supports various metacharacters, such as ., *, ,?, ^, $, [], {}, allowing complex matching patterns. Additionally, it has optional options like match_parameter (match case/multiple lines) and encoding (character encoding).

REGEXP_LIKE Usage in Oracle

The REGEXP_LIKE operator is used to perform regular expression matching in Oracle database. It checks whether a string matches a specified regular expression pattern and returns a Boolean value.

Syntax:

<code>REGEXP_LIKE(string, pattern)</code>

Parameters:

• string: Input string, To check if it matches the regular expression.
• pattern: Regular expression pattern, used to match strings.

Match pattern

Oracle supports various regular expression metacharacters, including:

• .: Match any single character.
• *: Matches the previous character zero or more times.
• : Matches the previous character one or more times.
• ?: Matches the previous character zero or one time.
• ^: Matches the beginning of the string.
• $: Matches the end of the string.
• []: Matches any single character within square brackets.
• {}: Matches the specified number of characters within square brackets.

Example:

Here is an example of how to use the REGEXP_LIKE operator:

<code>SELECT * FROM table_name WHERE column_name REGEXP_LIKE '%pattern%';</code>

This will return a match to the "pattern" part All records in the "column_name" column.

Other parameters

REGEXP_LIKE also has other optional parameters:

• ##match_parameter: is used to match upper and lower case or multiple lines.
• encoding: Specifies the character encoding of the string.

Note:

The REGEXP_LIKE operator is case-sensitive unless match_parameter is specified as "i", which means case is ignored.
• Regular expression patterns must be enclosed in single quotes, such as 'pattern'.

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