正则表达式 Regular Expressions

python method

  • search
    • wordlist = [w for w in nltk.corpus.words.words(‘en‘ ) ifw.islower()]
    • print [w for w in wordlist if re.search(‘ed$‘ ,w)]
  • findall
    • word = ‘supercalifragilisticexpialidocious‘
    • print re.findall(‘[abcd]‘, word)

注意点：

word = ‘dsupercalifragilisticexpialidocious‘

print re.findall(‘[abcd]‘,word)

print re.findall(‘^[abcd]‘,word)

print re.findall(‘[^abcd]‘,word)

分别代表：

匹配abcd任意一个

在开头匹配abcd任意一个

匹配非abcd任意一个

时间： 2024-10-25 06:36:55

正则表达式 Regular Expressions的相关文章

正则表达式Regular expressions

根据某种匹配模式来寻找strings中的某些单词 举例:如果我们想要找到字符串The dog chased the cat中单词 the,我们可以使用下面的正则表达式: /the/gi 我们可以把这个正则表达式分成几段: / 是这个正则表达式的头部 the 是我们想要匹配的模式 / 是这个正则表达式的尾部 g 代表着 global(全局),意味着返回所有的匹配而不仅仅是第一个. i 代表着忽略大小写,意思是当我们寻找匹配的字符串的时候忽略掉字母的大小写.

Using Regular Expressions in Python

1. 反斜杠的困扰(The Backslash) 有时候需要匹配的文本带有'\',如'\python',因为正则表达式有些特殊字符有特殊意义,所以需要前面加上'\'来消除特殊意义,这里匹配的正则表达式是'\\python',这时候如果要编译这个正则表达式需要re.compile('\\\\python'),因为在传递字符串的时候python本身就需要用'\\'来表示'\',也就造成了反斜杠的泛滥. 使用前缀'r'可以解决这个问题:’r'之后的'\'只是这个字符本身而没有特殊意义,比如r'\n'表

Eloquent JavaScript #09# Regular Expressions

索引 Notes js创建正则表达式的两种方式 js正则匹配方式(1) 字符集合 重复匹配 分组(子表达式) js正则匹配方式(2) The Date class 匹配整个字符串 Choice patterns 正则匹配的机制 回溯Backtracking Replace 贪婪匹配Greed 动态构建正则表达式 Search The lastIndex property 遍历匹配项 解析INI文件 国际字符 Excercise Regexp golf Quoting style Numbers

Python re module (regular expressions)

regular expressions (RE) 简介 re模块是python中处理正在表达式的一个模块 1 r"""Support for regular expressions (RE). 2 3 This module provides regular expression matching operations similar to 4 those found in Perl. It supports both 8-bit and Unicode strings; b

[转]8 Regular Expressions You Should Know

Regular expressions are a language of their own. When you learn a new programming language, they're this little sub-language that makes no sense at first glance. Many times you have to read another tutorial, article, or book just to understand the "s

正则表达式 ( Regular Expression )

正则表达式中的元字符 字符 说明 \ 将下一字符标记为特殊字符.文本.反向引用或八进制转义符.例如,“n”匹配字符“n”.“\n”匹配换行符.序列“\\”匹配“\”,“\(”匹配“(”. ^ 匹配输入字符串开始的位置.如果设置了 RegExp 对象的 Multiline 属性,^ 还会与“\n”或“\r”之后的位置匹配. $ 匹配输入字符串结尾的位置.如果设置了 RegExp 对象的 Multiline 属性,$ 还会与“\n”或“\r”之前的位置匹配. * 零次或多次匹配前面的字符或子表达式.

PCRE Perl Compatible Regular Expressions Learning

catalog 1. PCRE Introduction 2. pcre2api 3. pcre2jit 4. PCRE Programing 1. PCRE Introduction The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. PCRE has its own nat

8 Regular Expressions You Should Know

Regular expressions are a language of their own. When you learn a new programming language, they're this little sub-language that makes no sense at first glance. Many times you have to read another tutorial, article, or book just to understand the "s

Finding Comments in Source Code Using Regular Expressions

Many text editors have advanced find (and replace) features. When I’m programming, I like to use an editor with regular expression search and replace. This feature is allows one to find text based on complex patterns rather than based just on literal