Samuel wote:
> 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)
> -------------------
It gets easier:
import re
def variable_sub_cb(match):
return get_variable(match.group(1))
string_re = re.compile(r'(?<!\\)\$([A-Za-z]\w+)')
def get_variable(varname):
return globals()[varname]
variable1 = 'variable 1'
input = r'In this string $variable1 is substituted,'
input += 'while \$variable2 is not.'
print string_re.sub(variable_sub_cb, input)
or even
import re
def variable_sub_cb(match):
return globals()[match.group(1)]
variable1 = 'variable 1'
input = (r'In this string $variable1 is substituted,'
'while \$variable2 is not.')
print re.sub(r'(?<!\\)\$([A-Za-z]\w+)', variable_sub_cb, input)
Graham
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