python正则表达式 ^ $

在Python正则表达式中，^和$分别表示正则表达式的起始和结束位置。具体而言，^表示匹配字符串的开头，$表示匹配字符串的结尾。通常用来限定匹配的字符串必须要完全符合正则表达式的模式。如果在^和$之间的正则表达式与目标字符串完全匹配，那么匹配成功；否则匹配失败。<span class="em">1</span><span class="em">2</span>
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