How to pad a single digit in Title Name?

[DavidRTurner]

I want to pad my series' titles with a leading zero, when the title is "Episode x" (just one digit, ie. 1-9).
My format expression covers this for Season/Episode, but I want to capture "Episode 1" and replace with "Episode 01" in the Title.

Basically, it should be something like:

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{ fn.contains('Episode ' + /(\d{1})\b/ ) ? 'Episode 0' + $1 : fn }

but I cannot find a way to get the backreference working.

Any help appreciated...

[rednoah]

e.g.

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{ 'Episode 1'.replaceAll(/Episode \d/){ it.pad(2) } }

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Episode 01

The String.pad() helper notably works for any number in any String value:

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{ 'Episode 1'.pad(2) }

[DavidRTurner]

Thanks for the always-quick, red!!!

The example was using the filename, but the TITLE field is of course, what I meant.
I'm now using the simpler

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{t.pad(2)}

which seems to work perfectly for this, and also other cases.