in python you use Regular Expressions then first import re modules
The special characters are:
| "." | Matches any character except a newline. |
| "^" | Matches the start of the string. |
| "$" | Matches the end of the string or just before the newline at the end of the string. |
| "*" | Matches 0 or more occurrences |
| "+" | Matches 1 or more occurrences. |
| "?" | Matches 0 or 1 occurrences. |
| *?,+?,?? | Non-greedy versions of the previous three special characters. |
| {m,n} | Matches from m to n repetitions of the preceding RE. |
| {m,n}? | Non-greedy version of the above. |
| "\\" | Either escapes special characters or signals a special sequence. |
| [] | Indicates a set of characters.A "^" as the first character indicates a complementing set. |
| "|" | A|B, creates an RE that will match either A or B. |
| (...) | Matches the RE inside the parentheses.The contents can be retrieved or matched later in the string. |
| (?aiLmsux) | Set the A, I, L, M, S, U, or X flag for the RE (see below). |
| (?:...) | Non-grouping version of regular parentheses. |
| (?P |
The substring matched by the group is accessible by name. |
| (?P=name) | Matches the text matched earlier by the group named name. |
| (?#...) | A comment; ignored. |
| (?=...) | Matches if ... matches next, but doesn't consume the string. |
| (?!...) | Matches if ... doesn't match next. |
| (?<=...) | Matches if preceded by ... (must be fixed length). |
This module exports the following functions:
| match | Match a regular expression pattern to the beginning of a string. |
| search | Search a string for the presence of a pattern. |
| findall | Find all occurrences of a pattern in a string. |
match() function in python:it find only starting String first charecter or word
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.match(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se)
getRegularExpressions()
Enter the Search keyword :I'm
If you want print if search keyword match then use group() method
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.match(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se.group())
getRegularExpressions()
Enter the Search keyword :I'm I'm
If you want print if search keyword match starting and ending index then use start() and end() method
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.match(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se.start()," ",se.end())
getRegularExpressions()
Enter the Search keyword :I'm 0 3
span() method also print starting and ending index in tuple form
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.match(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se.span())
getRegularExpressions()
Enter the Search keyword :I'm (0, 3)
If search keyword not match.It return None
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.match(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se)
getRegularExpressions()
Enter the Search keyword :ashu None
search() function in python:it find enteriar String character or word only first occurrences.
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.search(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se)
getRegularExpressions()
Enter the Search keyword :programmer
If you want print if search keyword match then use group() method
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.search(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se.group())
getRegularExpressions()
Enter the Search keyword :programmer programmer
If you want print if search keyword match starting and ending index then use start() and end() method
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.search(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se.start()," ",se.end())
getRegularExpressions()
Enter the Search keyword :programmer 16 26
span() method also print starting and ending index in tuple form
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.search(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se.span())
getRegularExpressions()
Enter the Search keyword :programmer (16, 26)
If search keyword not match.It return None
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.search(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se)
getRegularExpressions()
Enter the Search keyword :ashu None
findall() function in python:it find enteriar String charecter or word.if word charecter or word match then return in list format
import re
def getRegularExpressions():
searchKeyword=input("Enter the Search keyword :")
se=re.findall(searchKeyword,"I'm not a great programmer; I'm just a good programmer with great habits.")
print(se)
getRegularExpressions()
Enter the Search keyword :programmer ['programmer', 'programmer']
import re
def getRegularExpressions():
print(re.match("[abc]","abc"))
print(re.match("[abc]","bca"))
print(re.match("[abc]","cab"))
print(re.match("[a-z]","aaaa"))
print(re.match("[0-9]","111"))
print(re.match("[123]","333"))
getRegularExpressions()
import re
def getRegularExpressions():
print(re.match("[abc]*",""))
print(re.match("[abc]*","."))
print(re.match("[abc]*","xyz"))
print(re.match("[abc]*","cab"))
print(re.match("[a-z]*","aaaa"))
print(re.match("[0-9]*","111"))
print(re.match("[123]*","333"))
getRegularExpressions()
import re
def getRegularExpressions():
print(re.match("[abc]+",""))
print(re.match("[abc]+","."))
print(re.match("[abc]+","xyz"))
print(re.match("[abc]+","cab"))
print(re.match("[a-z]+","aaaa"))
print(re.match("[0-9]+","111"))
print(re.match("[123]+","333"))
getRegularExpressions()
None None None
import re
def getRegularExpressions():
print(re.match("[abc]?",""))
print(re.match("[abc]?","."))
print(re.match("[abc]?","xyz"))
print(re.match("[abc]?","cab"))
print(re.match("[a-z]?","aaaa"))
print(re.match("[0-9]?","111"))
print(re.match("[123]?","333"))
getRegularExpressions()
