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String Library (String) 文本

The String library provides robust string manipulation utilities.

Literals & Escaping

String literals are enclosed in double quotes "...". You can use the backslash \ to escape characters:

  • \" - Double quote
  • \\ - Backslash
  • \n - New line
  • \t - Tab
  • \r - Carriage return

Example: print("Hello \"World\""); // Hello "World"

Methods

String.length(str)

Returns the number of characters in a string.

  • Example: String.length("hello"); // 5

String.charAt(str, index)

Returns the character at the specified index.

  • Example: String.charAt("abc", 1); // "b"

String.toLowerCase(str)

  • Example: String.toLowerCase("HELLO"); // "hello"

String.toUpperCase(str)

  • Example: String.toUpperCase("hello"); // "HELLO"

String.trim(str)

Removes leading and trailing whitespace.

  • Example: String.trim(" foo "); // "foo"

String.replace(str, search, replacement)

Replaces occurrences of a substring.

  • Example: String.replace("apple", "p", "b"); // "abble"

String.split(str, separator)

Splits a string into an array.

  • Example: String.split("a,b,c", ","); // ["a", "b", "c"]

String.substr(str, start, length)

  • Example: String.substr("hello", 1, 3); // "ell"

Tests if a string matches a regex pattern. Regex literals use the r"..." prefix and support escaping the double quote \" without interfering with regex backslashes.

  • Example: String.test("abc", r"^[a-z]+$"); // true
  • Example: String.test("quote\"", r"\"$"); // true

String.reverse(str)

  • Example: String.reverse("abc"); // "cba"