Simple batch renaming objects (regular expression driven)

rename.py

import re
import maya.cmds as cmds

class Rename(object):
    """ Rename objects en mass """
    pattern = ""
    replace = ""
    def __init__(s):
        sel = cmds.ls(sl=True)
        if not sel: return cmds.warning("You need to select at least one thing to renmae.")
        win_name = "rename_gui"
        if cmds.window(win_name, q=True, ex=True): cmds.deleteUI(win_name)

        win = cmds.window(win_name, t="Rename Objects", rtf=True)
        cmds.columnLayout(adj=True)
        s.pattern_field = cmds.textFieldGrp(l="Pattern:", tcc=lambda x: s.update_text(s.pattern_field, x))
        s.replace_field = cmds.textFieldGrp(l="Replacement:", tcc=lambda x: s.update_text(s.replace_field, x))
        cmds.button(l="Rename!", c=lambda x: s.go(sel))

        cmds.showWindow(win)

    def update_text(s, field, text):
        if field == s.pattern_field: s.pattern = text
        if field == s.replace_field: s.replace = text

    def go(s, selection):
        if not s.pattern: return cmds.warning("Remember to fill in a search pattern.")
        reg = re.compile(s.pattern, re.I)
        sub = s.replace
        modified = [b for b in ((a, reg.sub(sub, a)) for a in selection) if b[1] and b[0] != b[1]]
        if not modified: return cmds.confirmDialog(m="No change.")
        confirm = cmds.confirmDialog(t="Results", b=("Yes", "No"),db="No", cb="No", ds="No", m="\n".join("%s --> %s" % a for a in modified))
        if "Yes" == confirm:
            for obj in modified:
                try:
                    cmds.rename(*obj)
                except RuntimeError as e:
                    cmds.warning(str(e))

Rename()