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    <p>I tried to solve the problem of trimming a string on the first occurrence of a specific word and I didn't care about the original name of the method (<code>deleteLastOccurrence</code>) that is IMO misleading.</p> <p>The trick to match only single word and not subwords for me is to add two commas before and after the sentence and then check the word with commas. </p> <p>i.e. <code>",dog,"</code> will be checked against <code>",foo,bar,dog,cat,dog,bird,"</code> for presence.</p> <pre><code>package gicappa; public class So { public static String trimSentenceOnFirstOccurrenceOf(String sentence, String word) { if (word.isEmpty()) return sentence; if (!addCommasAround(sentence).contains(addCommasAround(word))) return sentence; return trimAddedCommasOf(substringOfSentenceUntilEndOfWord(addCommasAround(sentence), addCommasAround(word))); } public static String substringOfSentenceUntilEndOfWord(String string, String word) { return string.substring(0, string.indexOf(word) + word.length()); } public static String trimAddedCommasOf(String string) {return string.substring(1,string.length()-1);} public static String addCommasAround(String s) {return "," + s + ","; } } </code></pre> <p>and if you'd fancy some testing I used for TDD, here we go:</p> <pre><code>package gicappa; import org.junit.Test; import static gicappa.So.trimSentenceOnFirstOccurrenceOf; import static org.hamcrest.core.Is.is; import static org.hamcrest.core.IsEqual.equalTo; import static org.junit.Assert.assertThat; public class SoTest { @Test public void it_returns_the_same_sentence_for_empty_word() { assertThat(trimSentenceOnFirstOccurrenceOf("foo,bar,dog,cat,dog,bird", ""), is(equalTo("foo,bar,dog,cat,dog,bird"))); } @Test public void it_returns_the_same_sentence_for_not_contained_word() { assertThat(trimSentenceOnFirstOccurrenceOf("foo,bar,dog,cat,dog,bird", "s"), is(equalTo("foo,bar,dog,cat,dog,bird"))); } @Test public void it_returns_the_first_word() { assertThat(trimSentenceOnFirstOccurrenceOf("foo,bar,dog,cat,dog,bird", "foo"), is(equalTo("foo"))); } @Test public void it_returns_the_same_sentence_if_is_matched_the_last_word() { assertThat(trimSentenceOnFirstOccurrenceOf("foo,bar,dog,cat,dog,bird", "bird"), is(equalTo("foo,bar,dog,cat,dog,bird"))); } @Test public void it_trims_after_the_end_of_the_first_matched_word() { assertThat(trimSentenceOnFirstOccurrenceOf("foo,bar,dog,cat,dog,bird", "dog"), is(equalTo("foo,bar,dog"))); } @Test public void it_does_not_trim_for_a_subword_of_a_contained_word() { assertThat(trimSentenceOnFirstOccurrenceOf("foo,bar,dog,cat,dog,bird", "do"), is(equalTo("foo,bar,dog,cat,dog,bird"))); } @Test public void it_does_not_trim_for_a_subword_of_an_already_contained_word() { assertThat(trimSentenceOnFirstOccurrenceOf("dog,foozzo,foo,cat,dog,bird", "foo"), is(equalTo("dog,foozzo,foo"))); } } </code></pre> <p>A wordy refactoring for a more OO class could also be:</p> <pre><code>package gicappa; public class Sentence { private String s; public Sentence(String sentence) { this.s = sentence; } public String trimOnFirstOccurrenceOf(String word) { if (word.isEmpty() || csvSentenceContainsWord(word)) return s; return substringSentenceToEndOf(word); } private String substringSentenceToEndOf(String word) { return addCommasTo(s).substring(1, addCommasTo(s).indexOf(addCommasTo(word)) + addCommasTo(word).length()-1); } private boolean csvSentenceContainsWord(String word) { return !addCommasTo(s).contains(addCommasTo(word)); } public static String addCommasTo(String s) {return "," + s + ",";} } </code></pre> <p>with usage like:</p> <pre><code>new Sentence("dog,foozzo,foo,cat,dog,bird").trimOnFirstOccurrenceOf("foo"), is(equalTo("dog,foozzo,foo")) </code></pre>
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    1. PODelete last occurrence in string
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    1. COI think you have to return sentence.substring(0, sentence.indexOf(addCommasTo(word)) + word.length()); or you will match e.g. foo in "dog,foozzo,foo,cat,dog,bird" with "dog,foo" where instead you have to return dog,foozzo,foo
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      1. USAndrea Parodi
    2. COyups you are right but I have to grok it a bit more than that. Thanks
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