Regular expressions are special characters sequences that help you easily check whether a string matches a certain pattern.
Python has added the re module since version 1.5, which provides Perl-style regular expression patterns.
The re module enables the Python language to have all regular expression functions.
The compile function generates a regular expression object based on a pattern string and optional flag parameters. This object has a series of methods for regular expression matching and replacement.
The re module also provides functions that are exactly consistent with the functions of these methods, which use a pattern string as their first argument.
The use of python regular expressions (experimental code), the specific code is as follows:
import re
data='''12345 2019-05-20 13:30:04,102 E:/PythonProject/accountReport-20190520/createReport_20190520.py(164): [INFO]start=24h-ago&m=sum:{compared=week,redis=6380,endpoint=192.168.8.11_Redis-b}
2019-05-20 13:30:04,133 E:/PythonProject/accountReport-20190520/createReport_20190520.py(164): [INFO]start=24h-ago&m=sum:keys{redis=6380,endpoint=192.168.8.120_Redis-sac-a}
'''
# 1.1) Use of non-compiled regular expressionsdef re_nocompile():
pattern="report" #Match time format r=(pattern,data,flags=) # findall method Returns string print(r)
# 1.2) Use of compiled regular expressions (high efficiency)def re_compile():
pattern = "[0-9]{1,2}\:[0-9]{1,2}\:[0-9]{1,2}" # Match time format re_obj=(pattern) #Create an object r=re_obj.findall(data) # findall method Returns string print(r)
# 2.1) "Match" class functions use findall, match, search, finditerdef re_match():
pattern = "\d+" # Match numbers r=(pattern,data) The #match function is the beginning of the matching string, similar to startwith if r: # After successful match using match, return an object of type SRE_MATCH, which contains the relevant pattern and the original string, including the start position and the end position print(r)
print(())
print(())
print()
print(()) # group() is used to propose a string intercepted by a group. group() and group(0) match the overall result of regular expressions. # group(1) lists the first bracket matching part, group(2) lists the second bracket matching part, and group(3) lists the third bracket matching part. # Of course, there are no brackets in the regular expression, group(1) is definitely wrong print()
else: # If match does not match, return None print("False")
def re_search():
pattern = "[0-9]{1,2}\:[0-9]{1,2}\:[0-9]{1,2}" # Match time format r=(pattern,data) # The search method is a match for all positions, and returns the SRE_MATCH object print(r)
print(()) #First Location print(()) #End Location # finder returns an iteratordef re_finditer():
pattern = "\d+" # Match numbers r=(pattern,data)
for i in r:
print(())
# Greedy Match: Always match the longest string (default)# Non-greedy matching: Always match the shortest string (add it? to implement it when matching the string)def re_find02():
r1=("Python.*\.",data) # Greedy Match print(r1)
r2 = ("Python.*?\.", data) #Non-greedy match print(r2)
if __name__=="__main__":
re_nocompile()
re_compile()
re_match()
re_search()
re_finditer()
re_find02()
import re
import requests
data='''12345 2019-05-20 13:30:04,102 E:/PythonProject/accountReport-20190520/createReport_20190520.py(164): [INFO]start=24h-ago&m=sum:{compared=week,redis=6380,endpoint=192.168.8.11_Redis-b}
2019-05-20 13:30:04,133 E:/PythonProject/accountReport-20190520/createReport_20190520.py(164): [INFO]start=24h-ago&m=sum:keys{redis=6380,endpoint=192.168.8.120_Redis-sac-a}
'''
# 1) "Modify Class" function# 1.1) The sub function matches and replaces it, returning the replaced stringdef re_sub():
pattern = "[0-9]{1,2}\:[0-9]{1,2}\:[0-9]{1,2}" # Match time format data01=(pattern,"timeString",data)
print(data01)
# 1.2) Splite splits the string into a substring list, and can specify multiple separators at the same timedef re_split():
r=(r"[:\-\=]",("'"))
print(r)
# 2) An example of matching htmldef re_html():
r=("https:///")
print()
try:
web=("(https:.*?.com)",str())
print(web)
except Exception as err:
print(err)
if __name__=="__main__":
re_sub()
re_split()
re_html()
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