[Bug #990792] Mention that repl can be a callable
diff --git a/Lib/sre.py b/Lib/sre.py
index 0ff70dc..bb4bc16 100644
--- a/Lib/sre.py
+++ b/Lib/sre.py
@@ -139,7 +139,9 @@
def sub(pattern, repl, string, count=0):
"""Return the string obtained by replacing the leftmost
non-overlapping occurrences of the pattern in string by the
- replacement repl"""
+ replacement repl. repl can be either a string or a callable;
+ if a callable, it's passed the match object and must return
+ a replacement string to be used."""
return _compile(pattern, 0).sub(repl, string, count)
def subn(pattern, repl, string, count=0):
@@ -147,7 +149,9 @@
new_string is the string obtained by replacing the leftmost
non-overlapping occurrences of the pattern in the source
string by the replacement repl. number is the number of
- substitutions that were made."""
+ substitutions that were made. repl can be either a string or a
+ callable; if a callable, it's passed the match object and must
+ return a replacement string to be used."""
return _compile(pattern, 0).subn(repl, string, count)
def split(pattern, string, maxsplit=0):