PHP regex delimiters, / vs. | vs. {} , what are the differences?

Posted by powerboy on Stack Overflow See other posts from Stack Overflow or by powerboy
Published on 2010-05-23T17:44:59Z Indexed on 2010/05/23 17:50 UTC
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regex

In the PHP manual of PCRE, http://us.php.net/manual/en/pcre.examples.php, it gives 4 examples of valid patterns:

/<\/\w+>/
|(\d{3})-\d+|Sm
/^(?i)php[34]/
{^\s+(\s+)?$}

Seems that / , | or a pair of curly braces can use as delimiters, so is there any difference between them?

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