Use Match Group \g<n> in Replacement
Q
How to how to use matched string and groups in replacements with re.sub()?
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A
When calling the re.sub() function, you can use matched string and groups
in replacements with the following escape sequences:
\g<0> # represents the matched string \g<1> # represents the first group in matched string \g<2> # represents the first group in matched string ...
Here is Python example that shows you how to use matched string and groups in replacements with the re.sub() function:
>>> import re >>> s = "Hello perl.org, php.net, and python.org!" >>> p = "(\\w+)\\.(\\w+)" >>> print(p) (\w+)\.(\w+) >>> r = "www.\\g<0>" >>> print(r) www.\g<0> >>> f = re.sub(p,r,s) >>> print(f) Hello www.perl.org, www.php.net, and www.python.org! >>> r = "\\g<2>.\\g<1>" >>> print(r) \g<2>.\g<1> >>> f = re.sub(p,r,s) >>> print(f) Hello org.perl, net.php, and org.python!
⇒ re.split() - Splits with Regular Expression
⇐ re.sub() - Substitute Matches with String
2018-10-13, 406👍, 0💬
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