On Sun, 17 Jun 2007 11:00:58 +0000, Duncan Booth wrote:
> The elegant and lazy way would be to change your specification so that $
> characters are escaped by $$ not by backslashes. Then you can write:
>
>>>> from string import Template
>>>> ...
Thanks, however, turns out my specification of the problem was
incomplete: In addition, the variable names are not known at compilation
time.
I just did it that way, this looks fairly easy already:
-------------------
import re
def variable_sub_cb(match):
prepend = match.group(1)
varname = match.group(2)
value = get_variable(varname)
return prepend + value
string_re = re.compile(r'(^|[^\\])\$([a-z][\w_]+\b)', re.I)
input = r'In this string $variable1 is substituted,'
input += 'while \$variable2 is not.'
print string_re.sub(variable_sub_cb, input)
-------------------
-Samuel
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