regex search in python

Regex Search In Python

Regular Expressions known as regex, they are a powerful tool for searching and manipulation of text in various programming languages, applications, and operating systems.

A regex is a pattern made up of characters that define a search pattern.
By using regex we can search for specific patterns with a string or text files such as words, phrases, characters, or even patterns of characters.

Some common regex operators used in searches include:

• Characters: Match a specific character or set of characters.
• Anchors: Match the beginning or end of a line or string.
• Quantifiers: The number of times a character or set of characters should be matched should be specified.
• Alternation: Match one of several alternatives.
• Grouping: Group together parts of a pattern.
• Backreferences: Refer back to a previous match.

Code # 01

import re
s = r'f'
text = 'Failure is only possible if you give up trying.'
print(re.search(s,text))

Code Output

<re.Match object; span=(26, 27), match='f'>

*Lets see what is present in index no (26 to 27)

import re
s = r'f'
text = 'Failure is only possible if you give up trying.'
print(re.search(s,text))
print(text[26:27])

Code Output

f

Code # 02

import re
s = r'fail'
text = 'Failure is only possible if you give up trying.'
print(re.search(s,text))

Code Output

None 

Note: This python code search fail in given text (if not find fail in text it will return None)

Code # 03

import re
s = r'.possible.*up'
text = 'Failure is only possible if you give up trying.'
print(re.search(s,text))

Code Output

<re.Match object; span=(15, 39), match=' possible if you give up'>

*Lets see what is present in index no (15 to 39)

Code

text = 'Failure is only possible if you give up trying.'
print(text[15:39])

Code Output

possible if you give up

Code # 04

import re
s = r'^Failure.*possible'
text = 'Failure is only possible if you give up trying.'
print(re.search(s,text))

Code Output

<re.Match object; span=(0, 24), match='Failure is only possible'>

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