Simple Regular expression question

Code example.

#^[a-z0-9-]+\.[a-z0-9-\.]{2,8}$#si

PHP:

may i know what does the {2,8} $ means and what does the si means?

Help appreciated alot if anyone can explain the expression in layman terms.. thanks in advance

 

{2,8} means 2 to 8 of preceding characters
$ means end of string

More info on regex syntax at http://www.sitepoint.com/article/regular-expressions-php/2 (scroll down half the page)

 

si are modifiers for the pattern

s means a . (dot) will match new lines
i means the pattern is case-insensitive

 

can someone help me see if my reg expression is correct..

^([a-zA-z\-]{3,*})+$

PHP:

i want to allow only letters and dash(-). and minimum 3 characters.. this is what i come out with.. is it correct?

 

hi, i found out some problem with the code i use above. The letters and dash are correct, but the min 3 characters seem wrong, i couldn't figure that out. any advice or light appreciated.

 

I have not found solution with regexp to limit the length, BUT, you want the input to be letters and dash AND minimum length is 3, so i have other solution

$input = 'something';
if (preg_match('/^([a-z\-]+)+$/i', $input) && strlen($input) >=3) {
   echo('good');
}

PHP:

 

N or more characters is written as

{N,}

Code (markup):

Not as

{N,*}

Code (markup):

 

hi, what is the regular expression to allow whitespace is it

^([a-zA-z\-\s]{3,})+$ 

Code (markup):

??? is whitespace \s?

 

Yes, \s is any whitespace character.