python中使用正则表达式的连接符示例代码
前言
我们在前面的例子里,我们学习使用集合里字符或非集合里的字符,这时都是要把每个字符写出来的,但是有时需要把26个小写字母都放到集合里,那么按集合的方法,得输入26次,一个一个键入去,这样比较花时间,也容易出错,那么有没有更好的方法呢?这个是有的,就是使用正则表达式的连接符的功能:-,比如表示26个小写字符,就使用[a-z]就可以了。
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例子如下:
#python 3.6 #蔡军生 #http://blog.csdn.net/caimouse/article/details/51749579 # from re_test_patterns import test_patterns test_patterns( 'This is some text -- with punctuation.', [('[a-z]+', 'sequences of lowercase letters'), ('[A-Z]+', 'sequences of uppercase letters'), ('[a-zA-Z]+', 'sequences of letters of either case'), ('[A-Z][a-z]+', 'one uppercase followed by lowercase')], )
结果输出如下:
'[a-z]+' (sequences of lowercase letters) 'This is some text -- with punctuation.' .'his' .....'is' ........'some' .............'text' .....................'with' ..........................'punctuation' '[A-Z]+' (sequences of uppercase letters) 'This is some text -- with punctuation.' 'T' '[a-zA-Z]+' (sequences of letters of either case) 'This is some text -- with punctuation.' 'This' .....'is' ........'some' .............'text' .....................'with' ..........................'punctuation' '[A-Z][a-z]+' (one uppercase followed by lowercase) 'This is some text -- with punctuation.' 'This'
总结
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