RE strings (was: Variable Interpolation - status of PEP 215)

[Quinn Dunkan]

On 21 Jun 2002 10:44:50 -0700, Cimarron Taylor <cimarron+google at taylors.org>
wrote:
>   import re
>   def parseline3(line):
>      m = re.match(r'^EMP:([^,]*),([^,]*),([^,]*),([^,]*)$', line)
>      if m:
>          ...
>
>
>Unless I'm mistaken about how the re module works, parseline3 will
>recompile the regex each time it is called.  parseline2 avoids this

You are.  Mistaken, that is :)

Take a look at sre.py

Of course, if you did 20 regexes in the meanwhile, it would be recompiled.

I generally take the parseline2 approach anyway, though.