RegExp new line problem

Hello,

I have the following case:
^[a-zA-Z0-9]+$
This work. Allows to enter only Latin characters. But when I insert a new line ( Enter ) in the textarea is obtained mistake.
How to avoid this error when entering a new line with Enter?

Thanks.

 

Can't you just include the newline character in your regex like below:

^[a-zA-Z0-9\n]+$

Code (markup):

 

Simply use the g modifier and preg_match_all().

 

I think you should try this below Code
preg_replace("/[\n\r]/","<br />", $some_value);

 

If it's a textarea, you'd want FULL whitespace preservation, would you not? The above also strips SPACES -- if you want carriage returns, you probably want spaces too.

^[\w\s]+$

\s means all whitespace -- spaces, tabs and carriage return/linefeeds are matched. The \w is the same as a-zA-Z0-9 except it also includes underscore... which I usually would allow through as it's not usually a deal-breaker on anything.

Basically the above is the same as:

^[a-zA-Z0-9_\r\n\t\v\f ]+$

Just a hell of a lot easier to say... though I'll often allow those other control characters through, then compress [\t\v\f]+ to a single space with a replace.

 

you need to use the modifier s to ignore new lines. you can find out more about the php modifiers here: http://php.net/manual/en/reference.pcre.pattern.modifiers.php