Rename with regular expression and leading zeros

rename 's/result_([0-9]+)_([0-9]+)_([0-9]+)\.json\.txt/sprintf("%d%02d%02d.txt",$3,$2,$1)/ge' result_*.txt
Given a bunch of files with "wrong" date naming, it renames them in a "good" format.
Sample Output
result_26_2_2014.json.txt renamed as 20140226.txt
result_26_3_2014.json.txt renamed as 20140326.txt
result_26_4_2014.json.txt renamed as 20140426.txt
result_26_5_2014.json.txt renamed as 20140526.txt
result_26_7_2013.json.txt renamed as 20130726.txt
result_26_8_2013.json.txt renamed as 20130826.txt
result_26_9_2013.json.txt renamed as 20130926.txt

0
2014-06-13 07:34:32

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