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terryds

Confusing Regex

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I'm so confused about this regex code for URL

/\[([^\]]+)]\(([-a-z0-9._~:\/?#@!$&'()*+,;=%]+)\)/i

I'm so confused about this.... What i don't understand is this

([^\]]+)

Why this have double closing brackets ? Please help me....

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[] it is used to declare character class. Character inside it will be used to compare individually. ^ is negate character if used inside character class. Means [^f] will try to match any character other than 'f'. [^\]] it tells to match any charcter other than ']' as ']' character itself used in charcter class so it needs to be escaped. Hence '\]' used. + is quantifier which tells to match for 1 or more characters.

Edited by birbal

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