Blender - increment number in name (if any) while removing trailing blender incrementation

rename_increment.py

import bpy, re
#increment number in name (if any) while removing trailing blender incrementation
#ex: obj02.L.001 >> obj03.L
 
def checkNum(n):
    '''check if number in string (without trailing number)'''
    if len(n) > 4:        
        return any(char.isdigit() for char in n)
        #return bool(re.search(r'\d', inputString)) #regex method
    else:
        return (False)
 
def increment_rename(o):
    '''assign new name with incremented number'''
    name = o.name[:-4]
    try:
        regex = re.search('^(.*)(\d+)(.*)$', name) #regex with capture groups
        padding = len(regex.group(2))#get padding from source
        num = str(int(regex.group(2))+1).zfill(padding) #increment number captured and str/paddit
        new = regex.group(1) + num + regex.group(3)
        o.name = new
    except:
        print("regex error on ", o.name)
 
 
 
for o in bpy.context.selected_objects:
    if o.name[-4:-3] == ".": #if "." character before the end (.###)
        if checkNum(o.name):
            increment_rename(o)
        else:
            print(o.name, "hasn't number in name to increment")
    else:
        print (o.name, "not ending with '.###'")