Overview

EXPRESSO

Expresso: Object-Oriented Regular Expressions

Cariochi Expresso is a Java library that extends traditional regular expressions with object-oriented features, enabling hierarchical, modular, and reusable patterns. With Expresso, you can define and combine named patterns in YAML, apply them to text, and generate structured outputs like JSON. It’s perfect for parsing structured data, log files, or domain-specific texts while keeping your patterns maintainable and modular.

Example

Java Code

final String yaml = """
        Number:
            Integer: [ '\\d+' ]
            Real: [ '${Integer}\\.${Integer}' ]
        
        Currency:
            USD: [ '\\$', 'USD' ]
            EUR: [ '€', 'EUR' ]
        
        Money: [ '${Currency}${Number}', '${Number} ${Currency}' ]
        
        Percent: [ '${Number}%' ]
        """;

final String input = """
        Order total: $32.50 (tax: 12%)
        Refund issued: €45.67
        Discounts applied: 10% and 5%
        """;

final ExpressoMatcher matcher = Expresso.compile(yaml).matcher(input);
while (matcher.find()) {
    System.out.println(matcher.group());
}

Output

$32.50
12%
€45.67
10%
5%

Documentation is under construction and coming soon, but in the meantime, you can explore the library features using the online demo at https://demo.cariochi.com/.