^ - START OF STRING ANCHOR - ASSERTS THAT THE FOLLOWING PATTERN MUST OCCUR AT THE BEGINNING OF THE STRING. - ^Hello MATCHES "HELLO WORLD" $ - END OF STRING ANCHOR - ASSERTS THAT THE PRECEDING PATTERN ...
1. Start with a letter. 2. Contain only letters, digits, underscore '_', period '.', or dash '-' before '@'. 3. Have the domain '@leetcode.com'. Return the result table in any order. Approach / ...
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