python基础__re正则表达式

 1 import re
 2 
 3 Nameage = '''
 4 Janice is 22 and Theon is 33
 5 Gabriel is 44 and Joey is 21
 6 '''
 7 
 8 ages = re.findall(r'\d+', Nameage)  #查找出字符串中所有数字
 9 names = re.findall(r'[A-Z][a-z]*', Nameage) #找出以大写字母开头、小写字母其次、长度大于2的字符
10 
11 ageDict = {}
12 for i in names:
13     ageDict[i] = ages[names.index(i)]
14 print(ageDict) #{'Janice': '22', 'Theon': '33', 'Gabriel': '44', 'Joey': '21'}

1 import re
2 Str = "Sat, hat, mat, pat"
3 allStr = re.findall("[shmp]at", Str)
4 print(allStr) # ['hat', 'mat', 'pat']

1 import re
2 Str = "Sat, hat, mat, pat"
3 allStr = re.findall("[a-h]at", Str)
4 print(allStr) # ['hat']

1 import re
2 Str = "Sat, hat, mat, pat"
3 allStr = re.findall("[^a-h]at", Str) # ^表示反选
4 print(allStr) # ['Sat', 'mat', 'pat']

1 import re
2 randstr = "12345上山打老虎"
3 print("Matches:", len(re.findall("\d", randstr))) # Matches：5

1 import re
2 result=re.match("嫦娥\W号","嫦娥*号") #\W表示除[0－9a-zA-Z_]之外的字符
3 print(result) # 返回<re.Match object; span=(0, 4), match='嫦娥*号'>
4 a=result.group()
5 print(a) # 嫦娥*号

1 import re
2 result=re.search("嫦娥\d{2}号","嫦娥77号") # 长度取3的话，就会报错
3 print(result.group()) # 嫦娥77号