How to replace the first occurrence of a regular expression in Python?

Question

I want to replace just the first occurrence of a regular expression in a string. Is there a convenient way to do this?

Answer 1

Specify the count argument in re.sub(pattern, repl, string[, count, flags])

The optional argument count is the maximum number of pattern occurrences to be replaced; count must be a non-negative integer. If omitted or zero, all occurrences will be replaced.