Regex excluding a certain string

Hi
I have a question about how to search the strings that are in between a "start" and an "end". The results should not contain the word " cat ". All the strings with the format "start xxxxx yyyy end" that do not contain the word " cat " are valid. That is, the string "start XXX cat YYYY BBB end" should be rejected.
I am using the regex "start(.*?)end" to find all the strings that start with "start" and ending with "end".
The expression [^cat] can be used to negate the characters "cat" in any sequence (atc,act...). I want only to negate the sequence "cat". Any ideas about how to exclude the strings with "cat"in an effective way???
Regards

When you want to exclude whole
sequences of characters, you have to use negative
lookahead:
String regex =
"start\\s+((?!cat\\s+)\\S+\\s+)*?end";
How does this regex work and where the "next search starts" in case the match fails because the string " cat " was found.
We assume that there is a string "..startXXXVVVFF CC CAT xxx end......."
This regex searches for the string "start" (in position a). When it finds "start" it starts "looking ahead" for the occurrence of " cat " (position a + 10). The string "end" is in position a+20. That is, it will find the string " cat " before it finds "end". It will discard the match. After discarding the "match" where does the regex starts searching for a new "start"?
Does it start searching for a new match (sartXXXend)direct after the previous "start" (that is, at position a+1). Or does it starts searching after a new match after the previous "end" (at position a+21)????

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Message was edited by:
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Message was edited by:
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