In regex, we can match any character using period “.” character. To match only a given set of characters, we should use character classes.
1. Line Anchors In regex, anchors are not used to match characters. Rather they match a position i.e. before, after, or between characters. To match start and end of line, we use following anchors: Caret (^) matches the position before the first character in the string. Dollar ($) matches the position right after the last […]
Java example to use regular expressions to search and replace unwanted and non-printable characters ASCII characters from text file content.
In this java regular expression tutorial, we will learn to use regex to validate credit card numbers. We will learn about number format and validations of credit card numbers from multiple providers such as VISA, Mastercard, Amex and Diners etc. 1. Valid Credit Card Numbers Formats On an actual credit card, the digits of the […]
Learn to use regular expressions for UK postcode validation in Java. You can modify the regex to suit it for any other format such as US postal codes.