Java mask credit card number regex. number=1234567890123456 is missing in the String. The purpose of the following tutorial is to explain how the credit card number masking regular expression, or regex functions by breaking down its parts. . Dec 29, 2025 · In today’s digital age, protecting sensitive financial data like credit card numbers is paramount. Sep 20, 2011 · It keeps track of the next card number digit to be added to the masked string. Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. 'Market Lane Cafe $4. Aug 24, 2015 · Need to mask only 14 digit Credit card number and pin using regular expressions import java. Also learn about format and validations of credit cards with luhn Algorithm. \d - Match a single digit. $ - End string ancor. Matcher; import java. In Java, developers often rely on two common approaches for masking: a custom implementation using StringBuffer and May 24, 2023 · A regular expression, or regex, is a sequence of characters that forms a search pattern and used for matching, searching, replacing, extracting, and manipulating text strings based on specific patterns or rules. Credit card masking—hiding all but the last few digits (e. // e. , ****-****-****-1111)—is a critical practice to comply with regulations like PCI DSS and prevent data breaches. g. This would now mask any digit other than the third and last three regardless of their position (due to delimiters) in the formatted CC-number. Most of the time, you need to match a category of characters: any digit, any letter, any whitespace, or any character at all. Character classes are the regex feature that makes this possible. g 378282xxxxx0005 String maskedCreditCard = prefix + middle + suffix; // Take the original text with credit card, and replace the found credit // card with a masked credit card. If your application handles payment data, there is a real chance that credit card numbers end up in your telemetry. Feb 6, 2026 · Description: Use the OpenTelemetry Collector redaction processor with regex patterns to mask credit card numbers in span attributes before export. 50 3782-8224 6310005 Large Latte' A regex is good for a basic "does it look like a card number" but not much beyond that. This method assumes that length (cardNumber) = number of 'x' in mask + number of '#' is mask. I want to mask these credit card numbers. But of course card numbers don't come on a regular basis. Pattern; public class Mask{ static String text="+9199136 Learn to use regular expressions for credit card number validation in Java. // Mask the sub section of the credit card with 'x'. A collection of useful Regular Expressions to parse and validate Credit Card Numbers like Visa, MasterCard, American Express, Discover, etc. Jul 10, 2013 · Pattern Used in this sample is not optimized for Credit Card Numbers, this pattern will get any numerical numbers in the String Content. Learn how to effectively mask credit card numbers using regex in programming. Uncover the secrets of using regex to validate and extract credit card numbers with our Ultimate Guide. If you want to use regex just to know the card brand for visual use (like displaying Visa logo or label), that is fine. e. util. What java regex to create so that it robustly handles below situations? If [field=value] i. Based on the Credit Card Type a more efficient and Strict RegEx can be used to mask the Credit Card. Example 1: 1111222233334444 Example 2: 4444 3333 2222 1111 Example 3: 4444-3333-2222-1111 Example 4: 4444 - 3333 - 2222 - 1111 Example 5: 4444--3333--2222--1111 So I can mask for example 1, 2 and 3. When writing regular expressions, you rarely want to match a single specific character. e. May 9, 2018 · So this is really critical. Jul 2, 2020 · \D*\d - Match zero or more non-digits and a single digit. Instead of listing every individual character you want to match, you use a shorthand that represents an entire group. Secure sensitive data with our expert guidelines and code examples. ){1,3} - Close 2nd non capture group and match it 1 to 3 times. ) - Close negative lookahead. regex. Tags: java regex I am trying to mask the CC number, in a way that third character and last three characters are unmasked. Aug 14, 2013 · I want to create a mask for the number field in the above request so that when it is printed in the log it looks like 123456789012--HIDDEN-- (the last 4 digits are replaced with 'HIDDEN'). Feb 17, 2017 · Java Regex - mask credit card number Asked 11 years, 8 months ago Modified 9 years ago Viewed 18k times Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. NET, Rust. aqeejfi jvfhuv gauue zexpdy apgvc nsqg uqkgqj zltwuhm fqsnf hbyht