Regex Tester & Validator

Matches the literal sequence 'day' only when it appears at the start of a word, using the word boundary anchor \b. This ensures 'day' is preceded by a non-word character or the beginning of the string. Useful for searching for words that begin with 'day' (e.g., 'day', 'daylight') while ignoring occurrences in the middle or end of words like 'birthday' or 'today'.