Pattern matching email address using regular expressions

2018-07-03 05:50:51

Filter email address with regular expressions: I am new to regular expressions and was hoping someone might be able to help out.

I am trying to pattern match an email address string with the following format:

FirstName.LastName@gmail.com

I want to be sure that there is a period somewhere before the '@' character and that the characters after the '@' character matches gmail.com

Thanks, Brad

You want some symbols before and after the dot, so I would suggest .+..+@gmail.com .

.+ means any symbols (.) can appear 1 or more times (+)
. means the dot symbol; screened with backslash to suppress the special meaning of .
@gmail and com should be matched exactly.

See also Regular Expression Basic Syntax Reference

EDIT: gmail rules for account name only allow latin letters, digits, and dots, so a better regex is
[a-zA-Z0-9]+.[a-zA-Z0-9]+@gmail.com

You don't even need regex since your requirements are pretty specific. Not sure what language you're using, but most would support doing a split on @ and checking for a . . In python:

name, _, domain = email.partition('@')
if '.' in name and domain == 'gmail.com':
    # valid

你没有告诉我们你需要什么类型的正则表达式，但是这个例子将适合大多数：

.*..*@gmail.com

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