Text - Structure
Table of Contents
1 - About
When you find structure in a text file means that it describes a language.
It can be loosely language such as:
2 - Schema
The schema is expressed generally via Regular Expressions.
For computer language, a grammar is composed of parsing rule that are just Regular Expressions
But you may find parser that defines the structure manually at hand in the code for more grain control.
A regular expression is implemented as finite automata that's why when parsing any type of text (xml, json,..) with a library
you are going from state to state.