Python |仅从给定字符串中提取字符
给定一个字符串，任务是从字符串中只提取字母字符。下面给出了几个解决给定问题的方法。
方法#1:使用re.split
# Python code to demonstrate
# to get characters from string
import re
# initialising string
ini_string = "123()#$ABGFDabcjw"
ini_string2 = "abceddfgh"
# printing strings
print ("initial string : ", ini_string, ini_string2)
# code to find characters in string
res1 = " ".join(re.split("[^a-zA-Z]*", ini_string))
res2 = " ".join(re.split("[^a-zA-Z]*", ini_string2))
# printing resultant string
print ("first string result: ", str(res1))
print ("second string result: ", str(res2))
输出:
initial string : 123()#$ABGFDabcjw abceddfgh
first string result: ABGFDabcjw
second string result: abceddfgh
方法 2:使用re.fidall
# Python code to demonstrate
# to get characters in string
import re
# initialising string
ini_string = "123()#$ABGFDabcjw"
ini_string2 = "abceddfgh"
# printing strings
print ("initial string : \n", ini_string, "\n", ini_string2)
# code to find characters in string
res1 = " ".join(re.findall("[a-zA-Z]+", ini_string))
res2 = " ".join(re.findall("[a-zA-Z]+", ini_string2))
# printing resultant string
print ("first string result: ", str(res1))
print ("second string result: ", str(res2))
输出:
initial string :
123()#$ABGFDabcjw
abceddfgh
first string result: ABGFDabcjw
second string result: abceddfgh
方法三:使用isalpha()
# Python code to demonstrate
# to get characters in a string
# if present
# initialising string
ini_string = "123()#$ABGFDabcjw"
# printing string and its length
print ("initial string : ", ini_string)
# code to find characters in string
res1 = ""
for i in ini_string:
if i.isalpha():
res1 = "".join([res1, i])
# printing resultant string
print ("first result: ", str(res1))
输出:
initial string : 123()#$ABGFDabcjw
first result: ABGFDabcjw
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