Text - Structure


When you find a structure in a string, there is a language.

It can be a loosely language such as:

When the string describes a computer format, the string/text is called a document


The schema is expressed generally via Regular Expressions.

For computer language, a grammar is composed of lexer/parser 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.

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