containstoken

containstoken is a conceptual programming construct or function that checks for the presence of a specific token within a given string or sequence. The term "token" can vary depending on the context, but it generally refers to a distinct unit of meaning or data. For instance, in text processing, a token might be a word, a punctuation mark, or a specific substring. In programming language parsing, tokens are the fundamental building blocks like keywords, identifiers, and operators.

The purpose of a contains token operation is to determine if a particular pattern exists within a larger body of information. This is a common requirement in various software applications. Examples include searching for a keyword in a document, validating user input for specific characters, or parsing command-line arguments. The exact implementation of contains token would depend on the programming language and the specific type of data being searched. It typically returns a boolean value, true if the token is found, and false otherwise. More advanced versions might also return the position or count of the token's occurrences. This operation forms a fundamental part of string manipulation and pattern matching algorithms.