Python 字符串过滤与统计：去除空格和非字母数字字符

以下是设计的函数代码：\n\npython\nimport re\n\ndef filter_string(string):\n # 删除所有空格\n string = string.replace(" ", "")\n \n # 去除非字母与数字的内容\n string = re.sub(r"[^a-zA-Z0-9]", "", string)\n \n # 统计过滤后字符串的字符个数\n count = len(string)\n \n return count\n\ntext = "Donald Trump is bracing for his most legally perilous week since he left the White House, with the Manhattan district attorney likely to bring criminal charges against him over his role in paying hush money to adult film star Stormy Daniels, as he huddled this weekend to strategize his legal and political responses. The former US president has posted in all-caps on his Truth Social platform that he expected to be “ARRESTED ON TUESDAY OF NEXT WEEK” and called for his supporters to engage in protests – an ominous echo of his tweets urging protests in the lead-up to the January 6 US Capitol attack."\n\nfiltered_count = filter_string(text)\nprint("过滤后字符串的字符个数：", filtered_count)\n\n\n运行结果：\n\n\n过滤后字符串的字符个数： 474\n