# Basic concepts

### Allowed characters

The allowed characters are any kind of char that can be a part of the wrap. In this case it's a regular expression pattern that filters the [wrap](#wrap).

### Closing

The closing consists of characters that indicates the closing of the wrap.

### Opening

The opening consists of characters that indicates the opening of the wrap.

### Text

The text to wrap with the opening, and the closing or to check whether it is wrapped.

### Wrap

As a **noun**, in this case, wrap consists of the **opening**, and the **closing**.

As a **verb**, in this case, wraps the specified text around. The opening of the wrap is added **before** and the closing **after** the text.

### Wrapped

It is the text consists of a wrap opening at the beginning and closing at the end.

### Wrapper

A wrapper is an object consisting of a wrap, which can wrap the specified text around.