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Java/Python inverse regex

By dmytro - Posted on December 15th, 2009
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Very simple but not very obvious inverse java/python regex:

^(.(?!(some text)))*$

So "String with some text inside" will give us:

>>> re.compile("^(.(?!(some text)))*$")
>>> r = regex.search(string)
# No match was found:
>>> r

And "String without":

>>> re.compile("^(.(?!(some text)))*$")
>>> r = regex.search(string)
>>> r
<_sre.SRE_Match object at 0xc70014791f56cff8>
>>> regex.match(string)
<_sre.SRE_Match object at 0xc70014791f56ce00>

Tada :)

Links:
http://www.pythonregex.com/ - online python regex test tool