[TxMt] Language Grammar

Hi

I am trying to add a clause to my PHP language grammar that only affects a variable between square brackets/braces, for example it would match $bar from the following

$foo[$bar]

The language block I have is this

var_index = { name = 'variable.other.index.php'; match = '(?x) [($+)[a-zA-Z_\x{7f}-\x{ff}] [a-zA-Z0-9_\x{7f}-\x{ff}]*?\b]'; captures = { 1 = { name = 'punctuation.definition.variable.php'; }; }; };

The problem is that it affects the square brackets/braces as well as the variable inside them. How do I alter it to only affect the variable and not the brackets/braces?

Thanks in advance for any help Teifion

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