Hello,
Actually this is a follow-up of my earlier request to identify Sentence Boundaries while generating snippets for a search engine. The basic regex I have written to delimit sentence boundaries handles numbers and acronyms but I cannot get it to handle cases of
The full stops after Mr. Mrs. are automatically treated as sentence delimiters which is not desirable.
I tried the following syntax:

!(Dr\.|Mr\.|Mrs\.|Ms\.|[A-Z]\.|i\.e\.|w\.r\.t\.|e\.g\.|etc\.|viz\.)

Mr. Andrew came. Ms. Smith left for London. He brought three things viz. bread, cheese and wine This is w.r.t. your application

Instead of writing things for a regex to not match, try getting something else in your regex to match it first. Regexes do greedy matching so whatever matches it first 'wins'.

What language is this regex for? This works in grep:

$ echo "Mr. Andrew visited me.  fleeb narf stuff." | egrep -o "([a-zA-Z]|(Mr|Ms|Dr|Mrs)[.]| )*[.]"
Mr. Andrew visited me.
  fleeb narf stuff.

$

Many thanks. Works beautifully in egrep, but dies in Java. I wonder why. Does anybody know if Java demands a special regex set ?

regex really isn't the same everywhere. Might have been a good idea to post you were using java from the start.