让正则表达式变简单(PythonVerbalExpressions)

Posted 2021-05-02 Python程序员

正则表达式是编程学习过程中的一个难点, 很多人学习多年也无法精通. 昨天小编发现了一个Python库, 能够让正则表达式变得简单易用, 它就是PythonVerbalExpressions

使用案例一: 测试URL是否有效

from verbalexpressions import VerEx
# Create an example of how to test for correctly formed 
URLsverbal_expression = VerEx()
tester = (verbal_expression.
            start_of_line().
            find('http').
            maybe('s').
            find('://').
            maybe('www.').
            anything_but(' ').
            end_of_line()
)
# Create an example URL
test_url = "https://www.google.com"
# Test if the URL is valid
if tester.match(test_url):
    print "Valid URL"#Print the generated regex
print tester.source() # => ^(http)(s)?(\:\/\/)(www\.)?([^\ ]*)$

使用案例二: 字符串替换

#Create a test string
replace_me = "Replace bird with a duck"

#Create an expression that looks for the word "bird"
expression = VerEx().find('bird')

#Execute the expression in VerExresult_
VerEx = expression.replace(replace_me, 'duck')
print result_VerEx

#Or we can compile and use the regular expression using re
import re
regexp = expression.compile()
result_re = regexp.sub('duck', replace_me)
print result_re

字符串替换的简写

result = VerEx().find('red').replace('We have a red house', 'blue')
print result

安装方法一如既往地简单

pip install VerbalExpressions

很有趣, 有兴趣的同学可以试试哦~

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