正则 re.findall 的简单用法(返回string中所有与pattern相匹配的全部字串,返回形式为数组) 语法:
1 | findall(pattern, string, flags = 0 ) |
import re Python 正则表达式 re findall 方法能够以列表的形式返回能匹配的子串 # print (help(re.findall)) # print (dir(re.findall)) findall查找全部r标识代表后面是正则的语句
1 2 3 | regular_v1 = re.findall(r "docs" , "https://docs.python.org/3/whatsnew/3.6.html" ) print (regular_v1) # ['docs'] |
符号^表示匹配以https开头的的字符串返回,
1 2 3 | regular_v2 = re.findall(r "^https" , "https://docs.python.org/3/whatsnew/3.6.html" ) print (regular_v2) # ['https'] |
用$符号表示以html结尾的字符串返回,判断是否字符串结束的字符串
1 2 3 | regular_v3 = re.findall(r "html$" , "https://docs.python.org/3/whatsnew/3.6.html" ) print (regular_v3) # ['html'] |
# [...]匹配括号中的其中一个字符
1 2 3 | regular_v4 = re.findall(r "[t,w]h" , "https://docs.python.org/3/whatsnew/3.6.html" ) print (regular_v4) # ['th', 'wh'] |
“d”是正则语法规则用来匹配0到9之间的数返回列表
1 2 3 4 5 6 | regular_v5 = re.findall(r "\d" , "https://docs.python.org/3/whatsnew/3.6.html" ) regular_v6 = re.findall(r "\d\d\d" , "https://docs.python.org/3/whatsnew/3.6.html/1234" ) print (regular_v5) # ['3', '3', '6'] print (regular_v6) # ['123'] |
小d表示取数字0-9,大D表示不要数字,也就是出了数字以外的内容返回
1 2 3 | regular_v7 = re.findall(r "\D" , "https://docs.python.org/3/whatsnew/3.6.html" ) print (regular_v7) # ['h', 't', 't', 'p', 's', ':', '/', '/', 'd', 'o', 'c', 's', '.', 'p', 'y', 't', 'h', 'o', 'n', '.', 'o', 'r', 'g', '/', '/', 'w', 'h', 'a', 't', 's', 'n', 'e', 'w', '/', '.', '.', 'h', 't', 'm', 'l'] |
“w”在正则里面代表匹配从小写a到z,大写A到Z,数字0到9
1 2 3 | regular_v8 = re.findall(r "\w" , "https://docs.python.org/3/whatsnew/3.6.html" ) print (regular_v8) #['h', 't', 't', 'p', 's', 'd', 'o', 'c', 's', 'p', 'y', 't', 'h', 'o', 'n', 'o', 'r', 'g', '3', 'w', 'h', 'a', 't', 's', 'n', 'e', 'w', '3', '6', 'h', 't', 'm', 'l'] |
“W”在正则里面代表匹配除了字母与数字以外的特殊符号
1 2 3 | regular_v9 = re.findall(r "\W" , "https://docs.python.org/3/whatsnew/3.6.html" ) print (regular_v9) # [':', '/', '/', '.', '.', '/', '/', '/', '.', '.'] |