python function, append name to version number in given path with regex (look for version format like '_V02_' or '.v02' )

append_str_to_version_number.py

def regplace(text, add, c=None):
    '''
    Get a path and return it with string appended :
    Take a path containing a version number as first argument (parsed with the regex compiled passed as optional third arg)
    Return it with string (given as second argument) suffixed to version
    '''
    if not c:
        c = re.compile('([\.,_])([v,V]\d{2,3})([\.,_]?)')

    head, tail = os.path.split (text)
    splitpath = [head,tail]
    newSplitPath = []

    for p in splitpath:
        num = c.search(p)
        if p and num:
            try:
                if num.group(3): #if trailing separator exist replace it with preceding and place trailing after the new text
                    new = c.sub(num.group(1) + num.group(2) + num.group(1) + add + num.group(3), p)

                else: #if no trailing separator, simply place preceding as trailing and append new text
                    new = c.sub(num.group(0) + num.group(1) + add, p)

                newSplitPath.append(new)
            except:
                print ("could not find version in path:", p)

        else:
            newSplitPath.append(p)

    newPath = (os.path.join(newSplitPath[0], newSplitPath[1]))
    return (newPath)