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BAEL-5196 - Split a comma-separated string while ignoring commas in quotes (eugenp#11432)
* Creating the module 'core-java-string-operations-4' for new string related code samples. Implemented code samples for the article BAEL-5196 * including new module 'core-java-string-operations-4 in the parent project * fixing spacing in the pom file * fixing the maven configuration for our new project core-java-string-operations-4
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‎core-java-modules/core-java-string-operations-4/README.md‎

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### Relevant Articles:
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‎core-java-modules/core-java-string-operations-4/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-string-operations-4</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-string-operations-4</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.google.guava</groupId>
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<artifactId>guava</artifactId>
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<version>${guava.version}</version>
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</dependency>
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<dependency>
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<groupId>com.opencsv</groupId>
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<artifactId>opencsv</artifactId>
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<version>${opencsv.version}</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>${maven.compiler.source}</source>
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<target>${maven.compiler.target}</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<maven.compiler.source>11</maven.compiler.source>
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<maven.compiler.target>11</maven.compiler.target>
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<assertj.version>3.6.1</assertj.version>
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<guava.version>31.0.1-jre</guava.version>
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<opencsv.version>4.1</opencsv.version>
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</properties>
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</project>

‎core-java-modules/core-java-string-operations-4/src/main/java/com/baeldung/commaseparatedstring/SplitCommaSeparatedString.java‎

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package com.baeldung.commaseparatedstring;
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import java.io.IOException;
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import java.io.StringReader;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.regex.Pattern;
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import com.google.common.base.Splitter;
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import com.opencsv.CSVParser;
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import com.opencsv.CSVParserBuilder;
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import com.opencsv.CSVReader;
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import com.opencsv.CSVReaderBuilder;
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public class SplitCommaSeparatedString {
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public static List<String> splitWithParser(String input) {
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List<String> tokens = new ArrayList<String>();
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int startPosition = 0;
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boolean isInQuotes = false;
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for (int currentPosition = 0; currentPosition < input.length(); currentPosition++) {
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if (input.charAt(currentPosition) == '\"') {
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isInQuotes = !isInQuotes;
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} else if (input.charAt(currentPosition) == ',' && !isInQuotes) {
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tokens.add(input.substring(startPosition, currentPosition));
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startPosition = currentPosition + 1;
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}
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}
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String lastToken = input.substring(startPosition);
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if (lastToken.equals(",")) {
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tokens.add("");
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} else {
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tokens.add(lastToken);
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}
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return tokens;
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}
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public static List<String> splitWithRegex(String input) {
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String[] tokens = input.split(",(?=(?:[^\"]*\"[^\"]*\")*[^\"]*$)", -1);
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return Arrays.asList(tokens);
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}
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public static List<String> splitWithGuava(String input) {
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Pattern pattern = Pattern.compile(",(?=(?:[^\"]*\"[^\"]*\")*[^\"]*$)");
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Splitter splitter = Splitter.on(pattern);
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return splitter.splitToList(input);
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}
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public static List<String[]> splitMultiLineWithOpenCSV(String input) throws IOException {
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CSVParser parser = new CSVParserBuilder().withSeparator(',')
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.build();
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CSVReader reader = new CSVReaderBuilder(new StringReader(input)).withCSVParser(parser)
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.build();
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List<String[]> list = new ArrayList<>();
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list = reader.readAll();
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reader.close();
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return list;
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}
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}

‎core-java-modules/core-java-string-operations-4/src/test/java/com/baeldung/commaseparatedstring/SplitCommaSeparatedStringUnitTest.java‎

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package com.baeldung.commaseparatedstring;
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import static com.baeldung.commaseparatedstring.SplitCommaSeparatedString.splitMultiLineWithOpenCSV;
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import static com.baeldung.commaseparatedstring.SplitCommaSeparatedString.splitWithGuava;
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import static com.baeldung.commaseparatedstring.SplitCommaSeparatedString.splitWithParser;
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import static com.baeldung.commaseparatedstring.SplitCommaSeparatedString.splitWithRegex;
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import static org.hamcrest.MatcherAssert.assertThat;
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import static org.hamcrest.Matchers.contains;
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import static org.hamcrest.Matchers.hasSize;
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import static org.junit.Assert.assertArrayEquals;
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import java.io.IOException;
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import java.util.List;
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import org.junit.Test;
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public class SplitCommaSeparatedStringUnitTest {
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@Test
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public void givenSingleLineInput_whenParsing_shouldIgnoreCommasInsideDoubleQuotes() {
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String input = "baeldung,tutorial,splitting,text,\"ignoring this comma,\"";
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var matcher = contains("baeldung", "tutorial", "splitting", "text", "\"ignoring this comma,\"");
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assertThat(splitWithParser(input), matcher);
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assertThat(splitWithRegex(input), matcher);
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assertThat(splitWithGuava(input), matcher);
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}
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@Test
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public void givenMultiLineInput_whenParsing_shouldIgnoreCommasInsideDoubleQuotes() throws IOException {
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String input = "baeldung,tutorial,splitting,text,\"ignoring this comma,\"" + System.lineSeparator()
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+ "splitting,a,regular,line,no double quotes";
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String[] firstLine = new String[]{"baeldung", "tutorial", "splitting", "text", "ignoring this comma,"};
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String[] secondLine = new String[]{"splitting", "a", "regular", "line", "no double quotes"};
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List<String[]> result = splitMultiLineWithOpenCSV(input);
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assertThat(result, hasSize(2));
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assertArrayEquals(firstLine, result.get(0));
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assertArrayEquals(secondLine, result.get(1));
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}
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}

‎pom.xml‎

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<module>core-java-modules/core-java-jpms</module>
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<module>core-java-modules/core-java-os</module>
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<module>core-java-modules/core-java-string-operations-3</module>
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<module>core-java-modules/core-java-string-operations-4</module>
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<module>core-java-modules/core-java-time-measurements</module>
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<module>core-java-modules/multimodulemavenproject</module>
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<module>persistence-modules/sirix</module>

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