preg_split string into tokens

Question

I'm trying to write a regex with which I can split a string into tokens. This used to work:

$rawtokens = split("[^-_A-Za-z0-9]+", $string);

But now split() has been deprecated (and using preg_split is recommended), this doesn't work:

$rawtokens = preg_split("[^-_A-Za-z0-9]+", $string);

The error I get is that +\ is an unknown modifier. What's has changed with the migration from split to preg_split?

Answer 1

You need delimiters for PCRE regexes:

$rawtokens = preg_split("/[^-_A-Za-z0-9]+/", $string);
                         ^               ^

Answer 2

You can use T-Regx tool and you won't need delimiters :)

pattern('[^-_A-Za-z0-9]+')->split($string);

Answer 3

Try escaping the - and adding delimiters:

$rawtokens = preg_split("/[^\-_A-Za-z0-9]+/", $string);