Add class EscapingChars

for BAEL-839

core-java/src/main/java/com/baeldung/regexp/EscapingChars.java

@@ -0,0 +1,25 @@
+package com.baeldung.regexp;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class EscapingChars {
+    public boolean isMatching(String input, String pattern) {
+        return input.matches(pattern);
+    }
+
+    public int splitAndCountWords(String input, String pattern) {
+        return input.split(pattern).length;
+    }
+
+    public int splitAndCountWordsUsingQuoteMethod(String input, String pattern) {
+        return input.split(Pattern.quote(pattern)).length;
+    }
+
+    public String changeCurrencySymbol(String input, String pattern,
+            String correctStr) {
+        Pattern p = Pattern.compile(pattern);
+        Matcher m = p.matcher(input);
+        return m.replaceAll(correctStr);
+    }
+}