Java Regular Expressions

In regex, we can match any character using period “.” character. To match only a given set of characters, we should use character classes.

Regular expressions, commonly referred to as regex, are powerful tools for pattern matching and manipulation of text. The regex patterns enable developers to perform intricate string searches, substitutions, and validations. Among the plethora of regex features, line anchors are the key components for precisely identifying the beginning or end of …

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 …

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.

Learn to use regular expressions for Canada postal code validation. Also learn the rules which must be applied to a valid canadian postal zip code.

Learn to use regular expressions for US zip code validation in Java. Also learn the regex rules to check a valid USA postal code.

Learn to use regular expressions to test whether a user has entered a valid International Standard Book Number (ISBN).

In this Java regex tutorial, we will learn to test whether the number of words in input text is within a certain minimum and maximum limit.

In this java regex tutorial, we will learn to test whether the length of input text is between some minimum and maximum limit.

To create a regular expression that allows only alphanumeric characters, we can use the regex pattern ^[a-zA-Z0-9]+$. This pattern ensures that the string consists solely of uppercase alphabets, lowercase alphabets, and digits. Alphanumeric characters are all alphabets and numbers i.e. letters A–Z, a–z, and digits 0–9. 1. Alphanumeric Regex Pattern …

In this Java date validation using regex, we will learn to validate simple date formats such as mm/dd/yy, mm/dd/yyyy, dd/mm/yy and dd/mm/yyyy. Here we want to use a regex that simply checks whether the input is a valid date without trying to eliminate things such as February 31st. We might …

In this Java regular expression tutorial, we will learn to match any character which is part of “Greek Extended” unicode block or Greek script.

In this Java regex tutorial, learn to match all available currency symbols, e.g. $ Dollar, € Euro, ¥ Yen, in a String in Java.

In this Java regex example, we will learn to match trademark symbol ™ in a string using the regular expression.

Java regex word boundary example to match specific word or check if string contain word using Java regular expressions. java regex contain word example. java regex match specific word example.

Java regex word boundary example. Use regular expression word boundaries to find matching lines which start with or end with a certain words.

Java example of matching all common misspellings of any word in text content.