preg_match breaks with more then 5100 characters

I'm trying to match for plain text here is the regex

   $variable = "newteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewtest开发者_运维百科storynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststorynewteststor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   $result = preg_match('/^([a-zA-Z0-9 \n\r,!@#\$\.\+\-%\^&\(\)~`\'":;_=\?\\/\|\<\>\*\{\}])+$/',$variable);

and it fails and I can't figure out why

A few suggestions to try:

1. Move the + inside of the capture group so it needs to do less internal shifting.

   $result = preg_match('/^([a-zA-Z0-9 \n\r,!@#\$\.\+\-%\^&\(\)~`\'":;_=\?\\/\|\<\>\*\{\}]+)$/',$variable);
   

2. Why capture at all?

   $result = preg_match('/^[a-zA-Z0-9 \n\r,!@#\$\.\+\-%\^&\(\)~`\'":;_=\?\\/\|\<\>\*\{\}]+$/',$variable);
   

3. Why not just negate so it doesn't need to build up the internal state:

   $result = !preg_match('/[^a-zA-Z0-9 \n\r,!@#\$\.\+\-%\^&\(\)~`\'":;_=\?\\/\|\<\>\*\{\}]/',$variable);
   

What I think's happening is that you're over-running the internal buffer that pcre is using to keep track of the state. Give a try using a negated preg match (since you're not using the captured group anyway, all you care is if it has an invalid character)...

And a nitpick: $.+^()?<>*{} don't need escaping at all inside of a character block. The only ones that do are your delimiter (/), - and a leading ^ character (which doesn't apply to you.

You are matching too long text. It usually happen to me too when parsing very long subpatterns. Here are some things that you can try:

Remove the capturing parentheses:

$result = preg_match('/^[a-zA-Z0-9 \n\r,!@#\$\.\+\-%\^&\(\)~`\'":;_=\?\\/\|\<\>\*\{\}]+$/',$variable);

It might not work, as it still has to match very long text. Another way to do this is:

Do a negative match that matches only one character not in your set, and make sure that it does not match.

$result = preg_match('/[^a-zA-Z0-9 \n\r,!@#\$\.\+\-%\^&\(\)~`\'":;_=\?\\/\|\<\>\*\{\}]/',$variable);

$valid = !$result && strlen($variable) > 0;

P.S. Your code runs fine in my computer.