How to Extract Specific Part Of Column Using Regexp In Oracle?

To extract a specific part of a column using regular expressions (regexp) in Oracle, you can use the REGEXP_SUBSTR function. This function allows you to specify a regular expression pattern to match the part of the column you want to extract.

For example, if you have a column called "full_name" that contains values like "John Doe", and you want to extract only the first name from this column, you can use the following query:

SELECT REGEXP_SUBSTR(full_name, '^[^ ]+') as first_name FROM your_table;

In this query, the regular expression pattern '^[^ ]+' matches everything up to the first space in the "full_name" column, resulting in extracting only the first name.

You can customize the regular expression pattern to match specific parts of the column based on your requirements. Regular expressions provide a powerful way to extract specific parts of a column in Oracle.

What is the syntax for extracting repeating characters from a column using regexp in oracle?

The syntax for extracting repeating characters from a column using regexp in Oracle is as follows:

SELECT REGEXP_SUBSTR(column_name, '(.)\1+', 1, LEVEL) AS repeated_chars FROM table_name CONNECT BY REGEXP_SUBSTR(column_name, '(.)\1+', 1, LEVEL) IS NOT NULL;

In this syntax:

• column_name: the name of the column from which you want to extract repeating characters
• table_name: the name of the table containing the column
• '(.)\1+': the regular expression pattern that matches repeating characters
• LEVEL: a pseudo-column that represents the level in a hierarchical query
• REGEXP_SUBSTR: a function that returns the substring that matches the regular expression pattern
• CONNECT BY: a clause used to perform hierarchical queries.

How to extract specific part of column using regexp in oracle for phone numbers?

To extract a specific part of a column using regular expressions (regexp) in Oracle for phone numbers, you can use the REGEXP_SUBSTR function. Here is an example query that extracts the area code from a column named phone_number:

1
2

SELECT REGEXP_SUBSTR(phone_number, '\((\d{3})\)', 1, 1, NULL, 1) AS area_code
FROM your_table_name;

In this query:

• phone_number is the column that contains the phone numbers.
• '\((\d{3})\)' is the regular expression pattern that matches the area code enclosed in parentheses.
• 1, 1, NULL, 1 are the parameters for the REGEXP_SUBSTR function. The first 1 is the starting position of the match, the second 1 is the occurrence of the match (in case there are multiple matches), and NULL means that we want to return the whole matched substring. The last 1 specifies that we want to return the first capture group within the parentheses.

You can modify the regular expression pattern to extract other parts of the phone number, such as the country code, region code, or the phone number itself. Just adjust the pattern and capture group accordingly in the REGEXP_SUBSTR function.

What is the regex pattern for extracting alphabets from a column in oracle?

The regex pattern to extract alphabets from a column in Oracle can be specified as:

1
2

SELECT REGEXP_REPLACE(column_name, '[^[:alpha:]]', '') AS extracted_alphabets
FROM your_table;

This query will remove all non-alphabet characters from the specified column and return only the alphabets.

What is the regex pattern for extracting email addresses from a column in oracle?

The regex pattern for extracting email addresses from a column in Oracle can be written as:

1

[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}

This pattern matches an email address in the format local-part@domain, where the local part can contain letters, numbers, dots, underscores, percentage signs, and plus signs. The domain part can contain letters, numbers, dots, and hyphens, and must end with at least 2 letters (the top-level domain).