python-regexHow to perform a zero length match with Python Regex?
Zero length matches are matches that do not consume any characters. They can be used to find the position of a pattern in a string. In Python, this can be done using the re.search()
function with the \b
metacharacter.
import re
string = "Hello World"
match = re.search(r"\b", string)
if match:
print("Match found at position:", match.start())
Output example
Match found at position: 0
The code above uses the re.search()
function to search for a zero length match in the string "Hello World"
. The \b
metacharacter is used to indicate a zero length match. If a match is found, the match.start()
method is used to print the position of the match.
Code explanation
import re
: imports there
module which contains there.search()
functionstring = "Hello World"
: creates a string to search for a zero length matchmatch = re.search(r"\b", string)
: uses there.search()
function to search for a zero length match indicated by the\b
metacharacterif match:
: checks if a match was foundprint("Match found at position:", match.start())
: prints the position of the match if one was found
Helpful links
More of Python Regex
- How to match a YYYY-MM-DD date with Python Regex?
- How to match a year with Python Regex?
- How to match a UUID using Python regex?
- How to replace all using Python regex?
- How to use quantifiers in Python regex?
- How to match one or more occurence in Python regex?
- How to match a hex number with regex in Python?
- How to ignore case in Python regex?
- How to match a URL path using Python regex?
- How to match HTML tags with regex in Python?
See more codes...