晏殊词一首

破阵子
燕子欲归时节,高楼昨夜西风.求得人间成小会,试把金尊傍菊丛.歌长粉面红.
斜日更穿帘幕,微凉渐入梧桐.多少襟情言不尽,写向蛮笺曲调中.此情千万重.

for all lowercased sentences

Stanford corenlp has the caseless model.

If you want to provide one string as one sentence, use:

Properties props = new Properties();
            props.put("ssplit.eolonly", "true");
and append "\n" to your string.