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preg_match_all("#(^|\s|\()((http(s?)://)|(www\.))(\w+[^\s\)\<]+)#i", $str, $matches)

The |\s| in this regular () What does it mean? Does anyone know?

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preg_match_all("#(^|\s|\()((http(s?)://)|(www\.))(\w+[^\s\)\<]+)#i", $str, $matches)

The |\s| in this regular () What does it mean? Does anyone know?

I'll explain every part to the master.

#(^|\s|\()((http(s?)://)|(www\.))(\w+[^\s\)\<]+)#i

On both sides # is the PCRE delimiter, and the last one i indicates the case is ignored.

(^|\s|\()

The string begins with either a space separation or an opening parenthesis. This section is an unnamed grouping.

((http(s?)://)|(www\.))

Match http:// or https:// maybe www. . This section is an unnamed grouping, which is divided into two unnamed groupings.

(\w+[^\s\)\<]+)

Match at least one alphanumeric number, and then match at least one character that is not a space, a closing parenthesis, or a left angle bracket. Here is another unnamed grouping.

End.

Recommended two debug regular sites:

• Debuggex interface, powerful, support multi-lingual regular
• Regexper is better looking, only support JavaScript regular

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