REGEXP_REPLACE in Oracle - Examples & AI Generator

Mastering REGEXP_REPLACE in Oracle can be challenging, especially when crafting patterns or remembering Oracle's unique syntax nuances. For SQL developers, analysts, and engineers, translating business rules into the correct REGEXP_REPLACE code often slows down workflow. AI2sql eliminates this friction—allowing you to generate accurate Oracle queries from plain English prompts in just 10 seconds, no coding required.

REGEXP_REPLACE Syntax in Oracle

How Does Oracle REGEXP_REPLACE Work?

The REGEXP_REPLACE function replaces substrings matching a regular expression pattern within a string. Oracle’s syntax also supports position, occurrence, and match parameters.

REGEXP_REPLACE(source_string, pattern, replacement_string [, position [, occurrence [, match_parameter]]])

• source_string: The original text or column.

• pattern: The regular expression to search for.

• replacement_string: What to substitute for each match.

• position/occurrence/match_parameter: (Optional) Control search start, which match, and case-sensitivity.

Tip: Unlike some databases, Oracle supports advanced regex flags (e.g., 'i' for case-insensitive).

REGEXP_REPLACE Examples You Can Generate Instantly

Business-focused REGEXP_REPLACE Oracle Examples:

• 1. Remove all non-digit characters from a customer phone number:

  SELECT REGEXP_REPLACE(phone_number, '[^0-9]', '') AS cleaned_number FROM customers;

• 2. Replace multiple spaces with a single space in product descriptions:

  SELECT REGEXP_REPLACE(description, '\s+', ' ') AS normalized_description FROM products;

• 3. Mask all but last 4 digits of an order's credit card number:

  SELECT REGEXP_REPLACE(credit_card, '.(?=.{4})', '*') AS masked_cc FROM orders;

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FAQs about REGEXP_REPLACE in Oracle

• Q: Can I use REGEXP_REPLACE in an UPDATE statement?
  A: Yes. For example:
  UPDATE customers SET phone = REGEXP_REPLACE(phone, '[^0-9]', '');

• Q: How do I make REGEXP_REPLACE case-insensitive in Oracle?
  A: Add the 'i' match parameter: REGEXP_REPLACE(column, pattern, replacement, 1, 0, 'i').

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