cyj5201314的博客

// 只匹配出现在y后面的x 紧跟着y后面的x console.log(/(?<=y)x/.exec('acyx')); // 只匹配不是出现在y后面的x console.log(/(?<!y)x/.exec('asax')) // 只匹配出现在y前面的x console.log(/x(?=y)/.exec('xyqqa')); // 只匹配不是出现在y前面的x console.log(/x(?!y)/.exec('zsxsary')); ...

匹配单个字符 匹配多个字符

提取整数 import re s = "azx0.231xa54-*+895/5.23+56aax45as21e5wqdw2.wqd2-0.23wqd" res = re.findall(r"-?\d+", s) print(res) 提取小数 import re s = "azx0.231xa54-*+895/5.23+56aax45as21e5wqdw2.wqd2-0.23w...

1.re.search(a,b)用于在字符串b中匹配正则表达式a #分组提取字符串 text = "apple 's price is $299, orange 's price is $199" res = re.search(".*(\$\d+).*(\$\d+)", text) print(res.groups()) 输出结果为 (’$299’, ‘$199’) 2.re.findal...

1. 异或号^表示以…开始 ， 若在[]中表示取反操作 import re text = "hello" res = re.search("^h", text) res1 = re.search("^e", text) print(res.group()) print(res1) 输出结果为 h None Process finished with exit code 0 2. $表示以…...

一般来说url地址前几位为 http，https或ftp 后面跟:// 再之后可出现任意非空字符 #匹配url地址 url = "https://www.baidu.com" res = re.match("(http|https|ftp)://[^\s]+", url) print(res.group()) 输出结果为 https://www.baidu.com Process fin...

1. *表示匹配任意多个字符 \d*表示匹配任意多个数字字符 import re text = "123h1ello world" text1 = "123Hello world456" text2 = "hello world" res = re.match("\d*", text) res1 = re.match("\d*", text1) res2 = re.match...

re.match(a,b)方法匹配字符串b是否以a开头，是的话返回a，否则返回None 1.匹配某字符串a是否以字符b开头 import re text = "hello world" res = re.match("h", text) print(res.group()) 输出结果为 h None Process finished with exit code 0 2....