A string is said to be a correct sentence if it starts with the capital letter and ends with a full stop

段落匹配

Regular expression taken from the following tutorial: https://andrewwoods.net/blog/2018/name-validation-regex/ I added the first part of the expression (?!.*[@\.\_\d]) in order to not allow @ . _ and numbers cause I discovered a little weakness on the original expression. Thanks to Andrew Woods