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Sample Programs
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Output
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# To Check if string starts with "Welcome" and ends with
"expressions"
import re
textstring = "Welcome to python regular expressions"
vn = re.search("^Welcome.*expressions$", textstring)
if (vn):
print("String matched!")
else:
print("String Not match")
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String matched!
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# findall() to return a list contains all matched.
import re
txt = "Welcome to python regular expressions"
vn = re.findall("re", txt)
print(vn)
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['re', 're']
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#Return an empty list if no match was found
import re
txt = "Welcome to python regular expressions"
vn = re.findall("java", txt)
print(vn)
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[]
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#Search() for the first white-space character in the string
import re
txt = "Welcome to python regular expressions"
x = re.search("\s", txt)
print("First white space character located at position:", x.start())
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First white space character located at position: 7
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# Make a search that returns no match
import re
txt = "Welcome to python regular expressions"
vn = re.search("java", txt)
print(vn)
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None
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# split() returns a list where the string has been split
at each match
import re
txt = "Welcome to python regular expressions"
vn = re.split("\s", txt)
print(vn)
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['Welcome', 'to', 'python', 'regular', 'expressions']
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import re
txt = "Welcome to python regular expressions"
vn = re.split("\s", txt, 1)
print(vn)
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['Welcome', 'to python regular expressions']
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#sub()replaces character matches with the text of your given
import re
txt = "Welcome to python regular expressions"
vn = re.sub("\s", "9", txt)
print(vn)
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Welcome9to9python9regular9expressions
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# Replace the first 2 occurrences with a character
import re
txt = "Welcome to python regular expressions"
vn = re.sub("\s", "9", txt, 2)
print(vn)
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Welcome9to9python regular expressions
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