Regular Expression allow characters and 1 dot only between

Question

I want a regular expression which only allows az characters and 1 dot only between characters, not in the beginning or end of the string, here is what I've got:

var myRegexp = /^[a-zA-Z]*(\.{1}[a-zA-Z]*)?$/;

But it also allows the dot to be the first or the last character, how could I disallow dot in beginning or at the end of string?

The above code works in JS, how about the same regular expression in PHP with preg_match()?

Thanks in advance

Answer 1

The * means 0-many. If you use a + then this will force at least 1 character to appear before and after the dot. ie

var myRegexp = /^[a-zA-Z]+(\.{1}[a-zA-Z]+)?$/;

Answer 2

尝试这个

var myRegexp = /^[a-z]+(\.[a-z]+)?$/i;