Function id_start

pub const fn id_start() -> CodePointSetDataBorrowed<'static>

Characters that can begin an identifier. If using NFKC to fold differences between characters, use load_xid_start instead. See Unicode Standard Annex #31 for more details.

✨ Enabled with the compiled_data Cargo feature.

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Example

use icu::properties::sets;

let id_start = sets::id_start();

assert!(id_start.contains('x'));
assert!(!id_start.contains('1'));
assert!(!id_start.contains('_'));
assert!(id_start.contains('ߝ'));  // U+07DD NKO LETTER FA
assert!(!id_start.contains('ⓧ'));  // U+24E7 CIRCLED LATIN SMALL LETTER X
assert!(id_start.contains32(0xFC5E));  // ARABIC LIGATURE SHADDA WITH DAMMATAN ISOLATED FORM