#! python3
import shutil, re, os
datePattern = re.compile(r"""^(.*?)
    ((0|1)?\d)-
    ((0|1|2|3)?\d)-
    ((19|20)\d\d)
    (.*?)$
    """, re.VERBOSE)
for amerFilename in os.listdir('.'):
    mo = datePattern.search(amerFilename)
    if mo == None:
        continue
    beforPart = mo.group(1)
    monthPart = mo.group(2)
    dayPart = mo.group(4)
    yearPart = mo.group(6)
    afterPart = mo.group(8)
    euroFilename = beforPart + dayPart +'-' + monthPart + '-' + yearPart + afterPart
    absWorkindDir = os.path.abspath('.')
    amerFilename = os.path.join(absWorkindDir, amerFilename)
    euroFilename = os.path.join(absWorkindDir, euroFilename)
    shutil.move(amerFilename, euroFilename)