Simple Symbols

ardallie · ardallie · commit 9b6d07079bc6 · 2021-08-15T15:55:35.000+01:00
diff --git a/src/easy/SimpleSymbols.java b/src/easy/SimpleSymbols.java
@@ -0,0 +1,56 @@
+package easy;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Have the function SimpleSymbols(str) take the str parameter being passed
+ * and determine if it is an acceptable sequence by
+ * either returning the string true or false.
+ * The str parameter will be composed of + and = symbols
+ * with several characters between them (i.e. ++d+===+c++==a)
+ * and for the string to be true each letter must be surrounded
+ * by a + symbol. So the string to the left would be false.
+ * The string will not be empty and will have at least one letter.
+ */
+public class SimpleSymbols {
+
+  /**
+   * Simple Symbols function.
+   *
+   * @param str input string
+   * @return "true" if a sequence is acceptable
+   */
+  private static String simpleSymbols(String str) {
+    Pattern pattern1 = Pattern.compile("(?=(\\+\\w\\+))");
+    Pattern pattern2 = Pattern.compile("[a-z]");
+    Matcher matcher1 = pattern1.matcher(str);
+    Matcher matcher2 = pattern2.matcher(str);
+    int count1 = 0;
+    int count2 = 0;
+    int i1 = 0;
+    int i2 = 0;
+    while (matcher1.find(i1)) {
+      count1++;
+      i1 = matcher1.start() + 1;
+    }
+    while (matcher2.find(i2)) {
+      count2++;
+      i2 = matcher2.start() + 1;
+    }
+    return count1 == count2 ? "true" : "false";
+  }
+
+  /**
+   * Entry point.
+   *
+   * @param args command line arguments
+   */
+  public static void main(String[] args) {
+    var result1 = simpleSymbols("=+e++r+f+v+");
+    System.out.println(result1);
+    var result2 = simpleSymbols("=+e++r+ff+v+");
+    System.out.println(result2);
+  }
+
+}
