How is the function regexp_like used in Oracle?

In Oracle, REGEXP_LIKE is a regular expression function used to determine if a string matches a specified pattern. It returns a Boolean value (TRUE or FALSE) indicating whether the string matches the pattern.

The syntax of the REGEXP_LIKE function is as follows:

Check if the source string matches the specified pattern using regular expressions.

Among them:

1. The source_string is the string to be matched.
2. “Pattern is a regular expression pattern.”
3. The match_parameter is an optional parameter used to specify the matching parameter settings.

Some common examples of regular expression patterns:

1. ‘[0-9]’: matches any single digit.
2. ‘[a-zA-Z]’: Matches any letter.
3. ‘^[0-9]{3}$’ matches a string composed of three digits.
4. ‘^[\d]{3}$’: Similarly to the above example, use \d to match digits.

Some common examples of match_parameter parameters:

1. ‘i’: case insensitive.
2. ‘c’: Case-sensitive.
3. ‘m’: multi-line mode.

Select the column from the table where the column matches the specified pattern.

The above examples will return column values that match the specified pattern.