regular-expression

89 posts

How to Match Phone Numbers in a List to a Regex Pattern in Java ?

Last Updated: 23 July 2025

Regular Expressions are also known as regex or regexp. It is one of the powerful features of Java that helps in sequences of characters that define a search pattern. Nowad...read more

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Capitalize the First Letter of a String in Java Using Regex

Last Updated: 23 July 2025

In Java, we can use regular expressions to make the first character of each word in Uppercase as the word is represented as a String and string is the collection of charac...read more

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regular-expression

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Validate a Time Format (HH:mm:ss) Using Regex in Java

Last Updated: 23 July 2025

In this article, we will explore how to use regex to validate the used time format HH:mm:ss. Regular expressions (regex) offer a method, for validating time formats ensuri...read more

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regular-expression

Count a Group of Words in a String Using Regex in Java

Last Updated: 23 July 2025

Regular Expression is a powerful approach in Java for searching, Manipulating, and matching patterns with specific pattern requirements. In this article, we will learn to ...read more

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regular-expression

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Java Program to Find Occurrence of a Word Using Regex

Last Updated: 23 July 2025

Java's regular expressions, or regex, let you do advanced text manipulation and matching. Regex offers a handy approach for searching for a term in a text wherever it appe...read more

java-regular-expression

regular-expression

Java Examples

How to Reset the Pattern of a Regular Expression?

Last Updated: 23 July 2025

A regular expression pattern in Java is defined using the Pattern class, which is a component of the java.util.regex package. But sometimes, we may wish to reset the inter...read more

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How to find the last index using regex of a particular word in a String?

Last Updated: 25 January 2024

To find the last index of a particular word in a string using regular expressions in Java, you can use the Matcher class along with a regular expression that captures the ...read more

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How to Replace All Occurings of String Using Regex in Java?

Last Updated: 23 July 2025

Regex in Java is an interesting way to search for patterns in a string that the user provides. Expanded as Regular Expressions, It consists of some patterns that can be pl...read more

java-regular-expression

regular-expression

Java Examples

Java - Remove White Spaces from String using Regex

Last Updated: 23 July 2025

The Regex is an expression that is used for searching a required pattern or matching a required pattern or Manipulating the input based on requirements by using regex. Thi...read more

java-regular-expression

regular-expression

Java Examples

Validate Variable Names According to Naming Conventions in Java

Last Updated: 23 July 2025

Let's write a Java Program that checks whether a given variable name complies with the naming convention or not using Regular Expressions in Java. Example for Validating N...read more

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regular-expression

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How to Convert a Java String Against a Pattern Regex?

Last Updated: 23 July 2025

Regular expressions, or "regex," are an effective tool in Java programming for checking texts against a given pattern. This post will walk you through the process of util...read more

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Regular Expression Matching

Last Updated: 23 July 2025

Given a text t and a pattern p where t consists of only lowercase English alphabets while p consists of lowercase English alphabets as well as special characters '.' and '...read more

Validating Indian currency data using Regular expressions

Last Updated: 09 January 2024

Given some Indian Currency Data, the task is to check if they are valid or not using regular expressions. Rules for valid Indian Currency Data are:Indian Rupee format: The...read more

DSA

regular-expression

Extracting Repository Name from a Given GIT URL using Regular Expressions

Last Updated: 23 July 2025

Given a string str, the task is to extract Repository Name from the given GIT URL.Examples:GIT URL can be any of the formats mentioned below:Input: str="git://github.com/b...read more

Pattern Searching

DSA

regular-expression

Extracting Port Number from a localhost API Request to a Server using Regular Expressions

Last Updated: 23 July 2025

Given a String test_str as localhost API Request Address, the task is to get the extract port number of the service.Examples:Input: test_str = ‘http://localhost:8109/users...read more

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