pythonre.py

import re
# Program to extract numbers from a string
# Output: ['12', '89', '34']
string = 'hello 12 hi 89. Howdy 34'
pattern = '\d+'

result = re.findall(pattern, string)
print(result)

#re.split()
# Output: ['Twelve:', ' Eighty nine:', '.']
string = 'Twelve:12 Eighty nine:89.'
pattern = '\d+'

result = re.split(pattern, string)
print(result)



# sub()
# Program to remove all whitespaces
# multiline string
# Output: abc12de23f456
string = 'abc 12\
de 23 \n f45 6'

# matches all whitespace characters
pattern = '\s+'

# empty string
replace = ''

new_string = re.sub(pattern, replace, string)
print(new_string)

# subn()

new_str = re.subn(pattern, replace, string)
print(new_str)




string = '39801 356, 2102 1111'

# Three digit number followed by space followed by two digit number
pattern = '(\d{3}) (\d{2})'

# match variable contains a Match object.
match = re.search(pattern, string)

if match:
  print(match.group())
else:
  print("pattern not found")

# Output: 801 35

string = '\n and \r are escape sequences.'

result = re.findall(r'[\n\r]', string)
print(result)

# Output: ['\n', '\r']