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What's this delimeter (^) in PHP regex functions

I am using the delimiter /..../

in regex and I am using the character ^

used to indicate the start of a line or negation when used in a character class. So when I came across the line below using ^....^

I was puzzled:

$t = "172,249,L,P";
preg_split("^,^", $t);

What does it mean if anything?

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2 answers


You can use several different delimiters to ensure that they are not escaped on your particular regex string:



http://php.net/manual/en/regexp.reference.delimiters.php

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This code:

preg_split("^,^", $t);

matches this code:



preg_split("/,/", $t);

The use ^

as a delimiter for a regular expression and ^

as a metacharacter in a regular expression is unrelated.

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