java regex tutorial

### 1. importing the regex package
before you can use regex in java, you need to import the necessary classes:

### 2. creating a regex pattern
you can create a regex pattern using the `pattern` class. this class provides a method called `compile()` that takes a regex string as an argument.

### 3. creating a matcher
once you have a `pattern`, you can create a `matcher` object which will allow you to perform matching operations against a specified input string.

### 4. matching operations
the `matcher` class provides several methods to perform matching operations:

- **matches()**: checks if the entire input sequence matches the regex.
- **find()**: searches for the next subsequence that matches the pattern.
- **lookingat()**: checks if the beginning of the input sequence matches the regex.

#### example code

### 5. special characters in regex
regex has several special characters that are used to create complex patterns:

- `.`: matches any character except a newline.
- `^`: matches the beginning of a line.
- `$`: matches the end of a line.
- `*`: matches zero or more occurrences of the preceding element.
- `+`: matches one or more occurrences of the preceding element.
- `?`: matches zero or one occurrence of the preceding element.
- `{n}`: matches exactly n occurrences of the preceding element.
- `[]`: matches any one of the characters inside the brackets.
- `|`: acts as a logical or.

### 6. example with special characters

### 7. replacing text with regex
you can use the `replaceall()` and `replacefirst()` methods from the `string` class to replace parts of a string that match a regex pattern.

#### example code

### conclusion
regular expressions in java provide a versatile wa ...

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