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print arg
print arg
</source>
</source>
== Regular Expressions ==
<nowiki>
^ → Matches the beginning of a line
$ → Matches the end of a line
. → Matches any character
\s → Matches any whitespace
\S → Matches any non-whitespace
* → Repeats a character 0 or more times
*? → Repeats a character 0 or more times (non-greedy)
+ → Repeats a character 1 or more times
+? → Repeats a character 1 or more times (non-greedy)
[aeiou] → Matches a single character in the listed set
[^XYZ] → Matches a single character NOT in the listed set
[a-z0-9] → The set of characters can include a range
( → Indicates where string extraction is to start
) → Indicates where string extraction is to end</nowiki>
\ → Escape character
=== Regular Expression Module ===
It must be imported at the begining of a program:
<source lang="python">
import re
</source>
* re.search(re_string, string) → similar to find()
* re.findall(re_string, string) → similar to find, returns a list
* re.match(re_string, string)
<source lang="python">
import re
hand = open('mbox-short.txt')
for line in hand:
line = line.rstrip()
if re.search('^From:', line);
print line
</source>
== Files ==
== Files ==
== Class ==
== Class ==
== MySQLdb ==
== MySQLdb ==
== os.system() ==
== os.system() ==