How to replace a date in filename with current date in Groovy Script

Question

这是示例输入和输出文件，文件名不是恒定长度，并且长度不同，你能帮我在 groovy/java https://i.stack.imgur.com/vmFFM.png 中完成

Answer 1

You have a constant length date in filename and it.s located just before file extension.

Use regexp.

def today = new Date().format('yyyyMMdd')
def newName = "aaa_bbb_20201222.txt".replaceAll( /\d{6}(\.\w+)$/ , today+'$1' )

Regexp explained: https://regex101.com/r/Q5uDtS/1