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//// This module contains regular expression matching functions for strings.
//// The matching algorithms of the library are based on the PCRE library, but not
//// all of the PCRE library is interfaced and some parts of the library go beyond
//// what PCRE offers. Currently PCRE version 8.40 (release date 2017-01-11) is used.
pub external type Regex
/// When a regular expression fails to compile:
///
/// - error — a descriptive error message
/// - index — the index of the cause in the regex string
///
pub type FromStringError {
FromStringError(error: String, index: Int)
}
/// Create a new Regex.
///
/// ## Examples
///
/// > let Ok(re) = from_string("[0-9]")
/// > match(re, "abc123")
/// True
///
/// > match(re, "abcxyz")
/// False
///
/// > from_string("[0-9")
/// Error(
/// FromStringError(
/// error: "missing terminating ] for character class",
/// index: 4
/// )
/// )
///
pub external fn from_string(String) -> Result(Regex, FromStringError) =
"gleam_stdlib" "regex_from_string"
pub type Options {
Options(case_insensitive: Bool, multi_line: Bool)
}
/// Create a Regex with some additional options.
///
/// ## Examples
///
/// > let options = Options(case_insensitive: False, multi_line: True)
/// > let Ok(re) = from_string_with(options, "^[0-9]")
/// > match(re, "abc\n123")
/// True
///
/// > let options = Options(case_insensitive: True, multi_line: False)
/// > let Ok(re) = from_string_with(options, "[A-Z]")
/// > match(re, "abc123")
/// True
///
pub external fn from_string_with(
Options,
String,
) -> Result(Regex, FromStringError) =
"gleam_stdlib" "regex_from_string_with"
/// Returns a boolean indicating whether there was a match or not.
///
/// ## Examples
///
/// > let Ok(re) = from_string("^f.o.?")
/// > match(re, "foo")
/// True
///
/// > match(re, "boo")
/// False
///
pub external fn match(Regex, String) -> Bool =
"gleam_stdlib" "regex_match"
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