java regex javatpoint

### introduction to java regex

in java, the regex functionality is provided through three main classes:
1. **pattern**: this class is used to define a regex pattern.
2. **matcher**: this class is used to match a string against a regex pattern.
3. **patternsyntaxexception**: this exception is thrown when the regex pattern is invalid.

### basic syntax of regular expressions

- **literal characters**: match the exact characters (e.g., `a`, `b`, `c`).
- **meta-characters**: special characters that have specific meanings (e.g., `.`, `*`, `?`, `+`, `^`, `$`, `[]`, `()`, `{}`, `|`).
- **character classes**: define a set of characters to match (e.g., `[abc]` matches `a`, `b`, or `c`).
- **quantifiers**: specify how many times a character or group should appear (e.g., `a*` matches zero or more `a`s).

### basic operations

1. **creating a pattern**:


2. **creating a matcher**:


3. **finding matches**:

### example code

here’s a complete example that demonstrates how to use java regex to validate email addresses:

### explanation of the code

1. **regex pattern**: the regex pattern `^[a-za-z0-9._%+-]+@[a-za-z0-9.-]+\\.[a-za-z]{2,6}$` defines a valid email structure:
- `^` asserts the start of the string.
- `[a-za-z0-9._%+-]+` matches one or more alphanumeric characters or specific symbols before the `@` symbol.
- `@` matches the `@` symbol itself.
- `[a-za-z0-9.-]+` matches the domain name (e.g., `domain`).
- `\\.` matches the dot before ...

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