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Regular Expression In Python
Purpose
Example
import re
# \d+ or [0-9]+ - one or more numbers
# \w+ - Alphanumeric
# \s - white space
# \D - Non-digit
# \W - Non alphanumeric
# \S - Non-whitespace
pattern = r"\d+"
text = "my city pin code is 123456"
for match in re.finditer(pattern, text):
print(match.span())
Identifier Table
| Identifier | Meaning | Sample |
|---|
| \d+ or [0-9]+ | One or more numbers | |
| \w+ | Alphanumeric | |
| \s | White space | - • Abc cde
- • My name is gyan
|
| \D | Non-digit | |
| \W | Non-alphanumeric | |
| \S | Non-whitespace | |
Various Functions Of Match Object
import re
pattern = "\d+"
text = r"my phone number is 12345"
match = re.search(pattern, text)
print(match.span())
print(match.group())
print(match.start())
print(match.end())
Output
Functions
| Function | Purpose |
|---|
| Span | Returns the tuple of the starting and ending position of the match |
| Group | Returns the string matched using regular expression |
| Start | Returns the starting position of the match |
| End | Returns the ending position of the match |