CODEWITHSUNDEEP
pythonregexdjango
Hedde van der Heide
Hedde van der Heide

Reputation: 22449

Regex replacing a string while saving parts of it

I was wondering if it's possible to reserve some of an excisting value, while replacing. Example:

Original:

{u'America': u'A'}

After replacing:

{u'America': _(u'A')}

u\'[w]\' selects the value properly, however how do I save 'A' to the replacement value?

Upvotes: 2

Views: 622

Answers (1)

NPE
NPE

Reputation: 500317

Use a capture group:

In [13]: s = "{u'America': u'A'}"

In [14]: re.sub(r"(u'[\w]')", r"_(\1)", s)
Out[14]: "{u'America': _(u'A')}"

Here, (...) captures what's inside the parentheses, and \1 inserts it into the replacement string.

Upvotes: 3

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