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python:twistedlxmlandre [2015/10/09 02:48] – [re.findall] adminpython:twistedlxmlandre [2022/10/29 16:15] (current) – external edit 127.0.0.1
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 ==== Regular Expression Language ==== ==== Regular Expression Language ====
 A regular expression (abbreviated regex or regexp) is a sequence of characters that forms a search pattern\\ A regular expression (abbreviated regex or regexp) is a sequence of characters that forms a search pattern\\
-refer: http://msdn.microsoft.com/en-us/library/az24scfc(v=vs.110).aspx+refer:  
 +  * http://msdn.microsoft.com/en-us/library/az24scfc(v=vs.110).aspx 
 +  * python: https://docs.python.org/2/library/re.html#regular-expression-syntax
  
 **Match Character** **Match Character**
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     print email     print email
 </code>Understand pattern syntax above: </code>Understand pattern syntax above:
-  * [\w\.-]+ => Begin with one or multiple(sign: +) word(sign: \w) or character **.** or character **-**+  * [\w\.-]+ => Begin with one or multiple(sign: +) in group(sign: []): word(sign: \w) or character **.**(sign: \.) or character **-** 
 +  * @[\w\.-]+ => next of it is character @ and one or multiple characters in group: [word, **.** , **-**]
   - Example 2: <code python>   - Example 2: <code python>
 # Open file # Open file
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 text2 = re.sub("cool", "good", text) text2 = re.sub("cool", "good", text)
 print text2 print text2
 +</code>output<code>
 +Python for beginner is a very good website
 </code> </code>
       * Here is another example (taken from Googles Python class ) which searches for all the email addresses, and changes them to keep the user (1) but have yo-yo-dyne.com as the host.<code python>       * Here is another example (taken from Googles Python class ) which searches for all the email addresses, and changes them to keep the user (1) but have yo-yo-dyne.com as the host.<code python>
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 ## 1 is group(1), 2 group(2) in the replacement ## 1 is group(1), 2 group(2) in the replacement
  
-print re.sub(r'([w.-]+)@([w.-]+)', r'1@yo-yo-dyne.com', str) +print re.sub(r'([\w.-]+)@([\w.-]+)', r'1@yo-yo-dyne.com', str)
 ## purple alice@yo-yo-dyne.com, blah monkey bob@yo-yo-dyne.com blah dishwasher ## purple alice@yo-yo-dyne.com, blah monkey bob@yo-yo-dyne.com blah dishwasher
 +</code>output:<code>
 +purple alice@yo-yo-dyne.com, blah monkey bob@yo-yo-dyne.com blah dishwasher
 </code> </code>
   * re.compile: With the re.compile() function we can compile pattern into pattern objects, which have methods for various operations such as searching for pattern matches or performing string substitutions.    * re.compile: With the re.compile() function we can compile pattern into pattern objects, which have methods for various operations such as searching for pattern matches or performing string substitutions. 
python/twistedlxmlandre.1444358929.txt.gz · Last modified: 2022/10/29 16:15 (external edit)