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I need to print out formulas like "A{i}+B{i}+C{i}" for some i so it would look like A0+B0+C0 (for example). Is there any easy way to do it without regex?

I tried making regex but it's a bit inconvenient for this expression.

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You could use the String format to get a formatted output for some i as below (Ordinary indexing):

String.format("A%d+B%d+C%d", i, i, i)

But this can further shortened by using Relative indexing (argument from the previous format specifier is re-used)

String.format("A%d+B%<d+C%<d", i)

or Explicit Indexing (explicitly specifying the argument index to be used)

String.format("A%1$d+B%1$d+C%1$d", i)

Refer docs for more information

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Feels like a cleaner take on this is String.format("A%d+B%<d+C%<d", i). < is format-ese for 'previous argument'. Avoids having to repeat i 3 times. Starting with JDK.. 23 probably, STR."A\{i}+B\{i}+C\{i}" will do it.

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