Thanks for your explanation Moritz. I meant $1 value got changed similar to $_ value for better understanding. I know that $_ value getting changed due to substitute operator replaces matched digits to null string. I have a doubt in your example, how $1 value getting changed every recursive call. As per your code, your m// expression will match first digits ( 55 ) at all time as per my understanding. Of course, when I checked the code, it gives $1 value as 55, 666, 7777 and 1 respectively. Kindly give me some detail about it.
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