Regular Expressions | Python Tutorials For Absolute Beginners In Hindi #86

Re.txt file as described in the video!
Meta Characters
[] A set of characters
\ Signals a special sequence (can also be used to escape special characters)
. Any character (except newline character)
^ Starts with
$ Ends with
* Zero or more occurrences
+ One or more occurrences
{} Exactly the specified number of occurrences
| Either or
() Capture and group
Special Sequences
\A Returns a match if the specified characters are at the beginning of the string
\b Returns a match where the specified characters are at the beginning or at the end of a word r"ain\b"
\B Returns a match where the specified characters are present, but NOT at the beginning (or at the end) of a word

\d Returns a match where the string contains digits (numbers from 0-9)
\D Returns a match where the string DOES NOT contain digits
\s Returns a match where the string contains a white space character
\S Returns a match where the string DOES NOT contain a white space character
\w Returns a match where the string contains any word characters (characters from a to Z, digits from 0-9, and the underscore _ character)
\W Returns a match where the string DOES NOT contain any word characters
\Z Returns a match if the specified characters are at the end of the string

Code as described/written in the video



import re
mystr = '''Tata Limited
Dr. David Landsman, executive director
18, Grosvenor Place
London SW1X 7HSc
Phone: +44 (20) 7235 8281
Fax: +44 (20) 7235 8727
Email: tata@tata.co.uk
Website: www.europe.tata.com
Directions: View map

Tata Sons, North America
1700 North Moore St, Suite 1520
Arlington, VA 22209-1911
USA
Phone: +1 (703) 243 9787
Fax: +1 (703) 243 9791
66-66
455-4545
Email: northamerica@tata.com 
Website: www.northamerica.tata.com
Directions: View map fass
harry bhai lekin
bahut hi badia aadmi haiaiinaiiiiiiiiiiii'''

# findall, search, split, sub, finditer
# patt = re.compile(r'fass')
# patt = re.compile(r'.adm')
# patt = re.compile(r'^Tata')
# patt = re.compile(r'iin$')
# patt = re.compile(r'ai{2}')
# patt = re.compile(r'(ai){1}')
# patt = re.compile(r'ai{1}|Fax')


# Special Sequences
# patt = re.compile(r'Fax\b')
# patt = re.compile(r'27\b')
patt = re.compile(r'\d{5}-\d{4}')
# Task
# Given a string with a lot of indian phone numbers starting from +91

matches = patt.finditer(mystr)
for match in matches:
    print(match)


"""


"""


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