I only know the s/.../.../ variety. Haven't seen the "s[][]" variety yet.

They are the same, they just use different delimiters. You can choose which character(s) you use as a delimiter. If you use bracketing delimiters (eg. () or {} or [] or <>) then it can simplify the use of somethings. See the docs for the full skinny.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In reply to Re^3: How to match and transform a multiline pattern? by BrowserUk
in thread How to match and transform a multiline pattern? by nbhatia

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