In the first case, this part of your character class \)-< is a character range. Ie. It is equivalent to all the characters between ')' (ascii 41) and '<' (ascii 60), which includes ascii 44, ','.

In the second case, by placing the '-' as the first character inside the brackets, you've disabled the range function and it is treated as a normal character,

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In reply to Re: Order of terms in square braces by BrowserUk
in thread Order of terms in square braces by throop

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