def is_in_any_txt(txt, within_txts_list, case_insensitive=False):
    """is "txt" in any of the texts list ?"""
    for within_txt in within_txts_list:
        
        if case_insensitive: # slower
            if txt.lower() in within_txt.lower():
                return True
        else:
            if txt in within_txt:
                return True
    return False