Regular expression to allow trailing and leading s

问题:

I now validate email addresses like so:

[-+.'\w]+@[-.\w]+\.[-.\w]+

Which means that if users accidentally have a trailing or leading space in that address (e.g. when copy/pasting), the expression validates to false.

So I want to allow trailing and leading spaces on the above expression. How can I do so?

回答1:

Use \s* at the end and start of your regex. \s* means white spaces having zero or more occurrence.

回答2:

Consider the following Regex...

\s*[-+.'\w]+@[-.\w]+\.[-.\w]+\s*

Good Luck!