{"id":7380,"date":"2023-04-11T20:04:01","date_gmt":"2023-04-11T12:04:01","guid":{"rendered":"https:\/\/www.5x44.cn\/?p=7380"},"modified":"2023-04-11T20:04:01","modified_gmt":"2023-04-11T12:04:01","slug":"python%e6%ad%a3%e5%88%99%e8%a1%a8%e8%be%be%e5%bc%8f%e7%89%b9%e6%ae%8a%e5%ad%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/www.5x44.cn\/?p=7380","title":{"rendered":"python\u6b63\u5219\u8868\u8fbe\u5f0f\u7279\u6b8a\u5b57\u7b26"},"content":{"rendered":"\n<p>1\u3001<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">(?=&#8230;)<\/mark>\uff1a\u5411\u524d\u65ad\u8a00<em>lookahead assertion<\/em>\u3002<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">&#8230;<\/mark><\/strong>\u662f\u6b63\u5219\u8868\u8fbe\u5f0f<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\u6a21\u5f0f<\/mark>\uff0c\u7528\u4e8e\u5339\u914d\u4ee5\u6a21\u5f0f\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\uff0c\u4f46\u4e0d\u5305\u542b\u6a21\u5f0f\u5b57\u7b26\u3002\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#\npattern=r'&#91;\\w]+(?=Asimov)'\nstr1='IssacAsimov'\nre.search(pattern,str1).group(0)\n'Issac'<\/code><\/pre>\n\n\n\n<p>2\u3001<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">(?!&#8230;)<\/mark>\uff1a\u4e0e<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">(?=&#8230;)<\/mark>\u76f8\u53cd\uff0c\u7528\u4e8e\u5339\u914d<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">\u4e0d<\/mark><\/strong>\u4ee5\u6a21\u5f0f\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<p>3\u3001<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">(?&lt;=&#8230;)<\/mark>\uff1a\u5411\u540e\u65ad\u8a00<em>positive lookbehind assertion<\/em>\u3002<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">&#8230;<\/mark><\/strong>\u662f\u6b63\u5219\u8868\u8fbe\u5f0f<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\u6a21\u5f0f<\/mark>\uff0c\u7528\u4e8e\u5339\u914d\u4ee5\u6a21\u5f0f\u5f00\u5934\u7684\u5b57\u7b26\u4e32\uff0c\u4f46\u4e0d\u5305\u542b\u6a21\u5f0f\u5b57\u7b26\u3002\u6709\u4e00\u70b9\u8981\u6ce8\u610f\uff0c\u6a21\u5f0f\u7684\u957f\u5ea6\u5fc5\u987b\u662f\u56fa\u5b9a\u7684\uff0c\u4e0d\u80fd\u662f\u52a8\u6001\u7684\uff0c\u6bd4\u5982\u53ef\u4ee5\u662fabc\u6216a|b\uff0c\u4f46\u4e0d\u80fd\u662fa*\u6216a{3,4}\u3002<\/p>\n\n\n\n<p>4\u3001<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">(?&lt;!&#8230;)<\/mark>\uff1a\u4e0e<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">(?&lt;=&#8230;)<\/mark>\u76f8\u53cd\uff0c\u7528\u4e8e\u5339\u914d<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\"><strong>\u4e0d<\/strong><\/mark>\u4ee5\u6a21\u5f0f\u5f00\u5934\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<p>5\u3001<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">{m,n}<\/mark>\uff1a\u5339\u914d\u524d\u9762\u7684\u91cd\u590d\u5b57\u7b26m\u5230n\u6b21\uff0c\u5c3d\u53ef\u80fd\u7684\u591a\u5339\u914d\u3002\u5982a{3,5}\uff0c\u5bf9\u4e8e\u5b57\u7b26\u4e32&#8217;aaaaaaaab&#8217;\u53ef\u4ee5\u5339\u914d\u5230&#8217;aaaaab&#8217;\uff0c\u800c\u4e0d\u662f&#8217;aaab&#8217;\u3002<\/p>\n\n\n\n<p>6\u3001<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">{m}<\/mark>\uff1a\u7528\u4e8e\u5339\u914d\u7cbe\u786e\u7684m\u6b21\u524d\u7f6e\u5b57\u7b26\uff0c\u5982a{2}b\uff0c\u7528\u4e8e\u5339\u914d\u2018aab&#8217;\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001(?=&#8230;)\uff1a\u5411\u524d\u65ad\u8a00lookahead assertion\u3002&#8230;\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\u6a21\u5f0f\uff0c\u7528\u4e8e\u5339\u914d\u4ee5\u6a21\u5f0f\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\uff0c\u4f46\u4e0d\u5305\u542b\u6a21\u5f0f\u5b57\u7b26\u3002\u5982\uff1a &#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"https:\/\/www.5x44.cn\/?p=7380\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-7380","post","type-post","status-publish","format-standard","hentry","category-python3"],"_links":{"self":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/7380","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7380"}],"version-history":[{"count":1,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/7380\/revisions"}],"predecessor-version":[{"id":7381,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/7380\/revisions\/7381"}],"wp:attachment":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7380"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7380"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7380"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}