ID Continue

ID Continue is a character property that defines which characters are allowed to continue an identifier in programming languages and data formats, meaning they can appear after the first character of a name. It includes letters, digits, the underscore, and certain combining marks, but excludes characters like spaces, punctuation, and symbols that could break tokenization. This property is essential for lexers and parsers, as it ensures that identifiers like variable names or function labels are formed consistently across different scripts, supporting multilingual code. Unlike the related ID Start property, which sets the initial character, ID Continue permits additional characters such as numeric digits and certain diacritics to follow, but it does not allow hyphens or most punctuation. Its definition aligns with stable, non-visual characters, avoiding ambiguity in parsing and enabling predictable behavior in compilers and regex patterns.