Regular Expressions

Java RegEx: Part 12 — Possessive Quantifiers

Learn to boost performance of a regular expression with Possessive Quantifiers

In this part, we are going to explore another advanced technique supported in a regular…

Java RegEx: Part 11 — Reluctant (Non-greedy) Quantifiers

Understand how greedy and reluctant quantifiers work in regular expressions.

Hello, and welcome back. In this part, I’m going to discuss greedy and…

Java RegEx: Part 10 — Look-Behind

Explore the usefulness of Look-Behind techniques

Java RegEx: Part 10 — Look-Behind

In the last part, we had some examples using look-ahead techniques.

Java RegEx: Part 9 — Look-Ahead

In this part, we are going to discuss a very powerful technique in regular expression called Look-ahead.

The basic idea of look-ahead is similar in some situations in real life. For instance, you want to visit a friend, but you are not sure whether…

Java RegEx: Part 8 — Backreferences

Boost up your regular expression skills with backreferences technique

Java RegEx: Part 8 — Backreferences

Java RegEx: Part 7— Boundary Matcher

Learn how to use boundary matcher to conduct searching tasks

Consider the following cases:

We want to search for a sub-string, but only if it appears at the beginning or at…

Java RegEx: Part 6 — Group and Subgroup

Learn how to use groups and subgroups in regular expressions

Java RegEx: Part 5— matches(), lookingAt(), find()

Learn how to use matches(), lookingAt(), find() methods

In the previous part, we used regular expressions and the String.matches() method to check for the validity of the input…

Java RegEx: Part 4— Replacing and Extracting Text

In this part, we are going to explore methods that can be used to replace and extract text from a string, which are very common tasks in programming in general, not just in Java.

Replacing Text

Java RegEx: Part 3— Matching text for validation (Cont.)

In this part, we are going to use more complex patterns to check common strings that are used in real-life applications.