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    <p>I would recommend to adapt the <code>String[][]</code> to a <code>CharSequence</code>. Then you are free to do everything you can do with a <code>CharSequence</code> and this also means that you can use <code>java.util.regex.Matcher</code> to search for the string and you don't need to implement an own search algorithm. </p> <p>For example:</p> <pre><code>public class Main { public static void main(String[] args) { String[][] array2d = createArray(); int charSeqColumn = 0; CharSequence charSequnce = new Array2DColumnCharSequnce(array2d, charSeqColumn); System.out.println(charSequnce.toString()); Pattern patttern = Pattern.compile("ext"); Matcher matcher = patttern.matcher(charSequnce); while (matcher.find()) { String matchGroup = matcher.group(); int start = matcher.start(); int end = matcher.end() - 1; String msg = MessageFormat.format("{0} matched at: [{1}] - [{2}]", matchGroup, start, end); System.out.println(msg); } } private static String[][] createArray() { String[][] array2d = new String[2][10]; array2d[0][0] = "N"; array2d[0][1] = "e"; array2d[0][2] = "x"; array2d[0][3] = "t"; array2d[0][4] = " "; array2d[0][5] = "N"; array2d[0][6] = "e"; array2d[0][7] = "x"; array2d[0][8] = "t"; array2d[0][9] = " "; array2d[1][0] = "H"; array2d[1][1] = "e"; array2d[1][2] = "l"; array2d[1][3] = "l"; array2d[1][4] = "o"; array2d[1][5] = "W"; array2d[1][6] = "o"; array2d[1][7] = "r"; array2d[1][8] = "l"; array2d[1][9] = "d"; return array2d; } } </code></pre> <p>will output</p> <pre><code>Next Next ext matched at: [1] - [3] ext matched at: [6] - [8] </code></pre> <p>I would implement the <code>CharSequence</code> adaption like this</p> <pre><code>class Array2DColumnCharSequnce implements CharSequence { private int column; private String[][] array2d; private int endIndex; private int startIndex; public Array2DColumnCharSequnce(String[][] array2d, int column) { this(array2d, column, 0, array2d[column].length); this.array2d = array2d; this.column = column; } public Array2DColumnCharSequnce(String[][] array2d, int column, int startIndex, int endIndex) { this.array2d = array2d; this.column = column; this.startIndex = startIndex; this.endIndex = endIndex; } public int length() { return endIndex - startIndex; } public char charAt(int index) { String charString = array2d[column][startIndex + index]; return charString.charAt(0); } public CharSequence subSequence(int start, int end) { Array2DColumnCharSequnce array2dColumnCharSequnce = new Array2DColumnCharSequnce( array2d, column, start, end); return array2dColumnCharSequnce; } @Override public String toString() { StringBuilder sb = new StringBuilder(this); return sb.toString(); } } </code></pre> <p><strong>Note</strong>: The <code>Array2DColumnCharSequnce</code> is just a quick implementation and it does not address exception handling yet nor it addresses what happens when there are more than one char in a string column.</p> <p><strong>Why to use a <code>CharSequence</code> decorator</strong></p> <p>The difference with adapting the array to a <code>CharSequence</code> to other approaches is that you use a standard java interface that can be re-used with many other classes and thus is very flexible.</p> <p>Some often used standard java classes that take a <code>CharSequence</code> as parameter</p> <ul> <li><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html#contains-java.lang.CharSequence-" rel="nofollow"><code>String.contains(CharSequence s)</code></a></li> <li><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html#contentEquals-java.lang.CharSequence-" rel="nofollow"><code>String.contentEquals(CharSequence cs)</code></a></li> <li><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html#replace-java.lang.CharSequence-java.lang.CharSequence-" rel="nofollow"><code>String.replace(CharSequence target, CharSequence replacement)</code></a></li> <li><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Appendable.html#append-java.lang.CharSequence-" rel="nofollow"><code>Appendable.append(CharSequence csq)</code></a></li> <li><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/StringBuffer.html#append-java.lang.CharSequence-" rel="nofollow"><code>StringBuffer.append(CharSequence s)</code></a></li> <li><a href="http://docs.oracle.com/javase/8/docs/api/index.html?java/lang/CharSequence.html" rel="nofollow"><code>StringBuilder.append(CharSequence s)</code></a></li> </ul> <p>See the full list <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/class-use/CharSequence.html" rel="nofollow">here</a>.</p> <p>Use the code above and try this to see how flexibe the decorator is.</p> <pre><code>public static void main(String[] args) { String[][] array2d = createArray(); CharSequence charSequnce = new Array2DColumnCharSequnce(array2d, 0); boolean contentEquals = "Next Next ".contentEquals(charSequnce); System.out.println(contentEquals); CharSequence column1CharSequnce = new Array2DColumnCharSequnce(array2d, 1); String replaced = "I want to say Next Next ".replace(charSequnce, column1CharSequnce); System.out.println(replaced); } </code></pre> <p>will output</p> <pre><code>true I want to say HelloWorld </code></pre> <p>Finally everyone has to decide what he/she wants and what fits the situation. I prefer implementations that give me more options if I can get them "almost" for free.</p>
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    1. COHow can I get more than one match strings by this way?
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    2. CO@R4j Use a loop with `Matcher.find()`. I updated my answer.
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    3. COThanks, I wonder do we need a `CharSequence`? I just export my first column to a string, then use `Matcher` to find, just like @Trying said, it is similar to search a subString in a String. For example, I search `next` in `abcdnextponexnextpour` by using Matcher and regex and got the same result. Do you think there is something wrong with this way?
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