Búsqueda y Prueba

Verificación de prefijo, sufijo y substring; validación de URL y extensión de archivo.

// Feature: Searching and testing strings

// Syntax: `.contains(sub)`, `.starts_with(p)`, `.ends_with(s)`

// When to use: validate format, filter, decide without regex.


use std::regex
use std::url

let phrase = "the quick brown fox"

// -- contains: does the substring exist? ------------------------

print(phrase.contains("quick"))
// expected: true

print(phrase.contains("cat"))

// expected: false


// -- starts_with / ends_with -----------------------------------

print(phrase.starts_with("the"))
// expected: true

print(phrase.ends_with("fox"))
// expected: true

print(phrase.starts_with("THE"))

// expected: false (case-sensitive)


// -- Practical cases -------------------------------------------


// Validate URL prefix.

fn is_https(url: str) -> bool {
  return url.starts_with("https://")
}

print(is_https("https://zolo-lang.devzolo.com"))  // true

print(is_https("http://example.com"))  // false


// Validate file extension.

fn is_image(name: str) -> bool {
  return name.ends_with(".png") || name.ends_with(".jpg")
}

print(is_image("photo.png"))  // true

print(is_image("doc.pdf"))  // false


// Filter list by substring.

let files = ["main.zolo", "test.rs", "lib.zolo", "build.sh"]
for f in files {
  if f.contains(".zolo") {
    print(f)
  }
}
// expected:

// main.zolo

// lib.zolo