# Regular Expression

A text pattern used to find, validate, or replace matching characters.

## What is **Regular Expression** in Java?

**Regular Expression** — A text pattern used to find, validate, or replace matching characters.

```java
class OrderId {
    boolean isValid(String value) {
        return value.matches("ORD-\\d{4}");
    }
}
```

Level: Freelancer · [More Java terms at this level](https://www.ask-codey.com/glossary/subjects/java/freelancer)

Updated: September 27, 2026

## In other subjects

- [Regular Expression in C#](https://www.ask-codey.com/glossary/regular-expression-c-sharp)
- [Regular Expression in JavaScript](https://www.ask-codey.com/glossary/regular-expression-javascript)

Source: https://www.ask-codey.com/glossary/regular-expression-java