my notes

User Tools

Site Tools

Trace:
python:twistedlxmlandre

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
Last revisionBoth sides next revision
python:twistedlxmlandre [2015/10/09 02:36] – [re Package(Regular Expression)] adminpython:twistedlxmlandre [2015/10/27 00:08] – [Regular Expression Language] admin
Line 532: Line 532:
 ==== 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**
Line 574: Line 576:
 </code> </code>
 === re.findall === === re.findall ===
-  * re.findall: The findall() is probably the single most powerful function in the re module<code python>+findall: The findall() is probably the single most powerful function in the re module 
 +  - Example 1: <code python>
 str = 'purple [email protected], blah monkey [email protected] blah dishwasher' str = 'purple [email protected], blah monkey [email protected] blah dishwasher'
  
Line 583: Line 586:
     # do something with each found email string     # do something with each found email string
     print email     print email
-</code>    <code python>+</code>Understand pattern syntax above: 
 +  * [\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>
 # Open file # Open file
 f = open('test.txt', 'r') f = open('test.txt', 'r')
Line 686: Line 692:
 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>
Line 694: Line 702:
 ## 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'[email protected]', str) +print re.sub(r'([\w.-]+)@([\w.-]+)', r'[email protected]', str)
 ## purple [email protected], blah monkey [email protected] blah dishwasher ## purple [email protected], blah monkey [email protected] blah dishwasher
 +</code>output:<code>
 +purple [email protected], blah monkey [email protected] 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.txt · Last modified: 2022/10/29 16:15 by 127.0.0.1