參考部落格原址：https://blog.csdn.net/YZXnuaa/article/details/79346963
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<pre>正則 re.findall 的簡單用法（傳回string中所有與pattern相比對的全部字串，傳回形式為數組）
文法：
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import re Python 正規表達式 re findall 方法能夠以清單的形式傳回能比對的子串
print (help(re.findall))
print (dir(re.findall))
findall查找全部r辨別代表後面是正則的語句
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符号^表示比對以https開頭的的字元串傳回, | 1 2 3 | |
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符号表示以html結尾的字元串傳回,判斷是否字元串結束的字元串</pre><div class="cnblogs_Highlighter sh-gutter"><div><div class="syntaxhighlighter python"><div class="table-box"><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div></td><td class="code"><div><div class="line number1 index0 alt2"><code class="python plain">regular_v3 </code><code class="python keyword">=</code> <code class="python plain">re.findall(r</code><code class="python string">"html
符号表示以html結尾的字元串傳回,判斷是否字元串結束的字元串</pre><divclass="cnblogsHighlightersh−gutter"><div><divclass="syntaxhighlighterpython"><divclass="table−box"><tablecellspacing="0"cellpadding="0"border="0"><tbody><tr><tdclass="gutter"><divclass="linenumber1index0alt2">1</div><divclass="linenumber2index1alt1">2</div><divclass="linenumber3index2alt2">3</div></td><tdclass="code"><div><divclass="linenumber1index0alt2"><codeclass="pythonplain">regularv3</code><codeclass="pythonkeyword">=</code><codeclass="pythonplain">re.findall(r</code><codeclass="pythonstring">"html" , “https://docs.python.org/3/whatsnew/3.6.html” ) print (regular_v3) # [‘html’] # […]比對括号中的其中一個字元
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“d”是正則文法規則用來比對0到9之間的數傳回清單 | 1 2 3 4 5 6 | |
小d表示取數字0-9，大D表示不要數字，也就是出了數字以外的内容傳回 | 1 2 3 | |
“w”在正則裡面代表比對從小寫a到z,大寫A到Z，數字0到9 | 1 2 3 | |
“W”在正則裡面代表比對除了字母與數字以外的特殊符号 | 1 2 3 | |
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