diff --git a/src/JRexFrame.java b/src/JRexFrame.java
index 8d6d897..7b36c9f 100644
--- a/src/JRexFrame.java
+++ b/src/JRexFrame.java
@@ -2,6 +2,7 @@
 import java.awt.Color;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
 import javax.swing.JFileChooser;
 import javax.swing.JOptionPane;
 import javax.swing.SpinnerNumberModel;
@@ -358,48 +359,89 @@
 		String regex = txtRegex.getText();
 		String text = txtInput.getText();
 
-		String[] input = text.split("\n");
+		String[] input = null;
 
-		Pattern pattern = Pattern.compile(regex);
+		try {
 
-		DefaultTableModel model = new DefaultTableModel();
-		jTable.setModel(model);
+			Pattern pattern = Pattern.compile(regex);
 
-		int numMatches = 0;
+			int flagsMask = pattern.flags();
 
-		for (String line : input) {
-			Matcher matcher = pattern.matcher(line);
-			if (matcher.find()) {
+			StringBuilder flags = new StringBuilder();
 
-				numMatches++;
+			boolean dotall = false;
 
-				int groupCount = matcher.groupCount();
-
-				model.setColumnCount(groupCount);
-
-				Object[] headers = new Object[groupCount];
-
-				for (int k = 0; k < groupCount; k++) {
-					headers[k] = k + 1;
-				}
-
-				model.setColumnIdentifiers(headers);
-
-				txtOutput.append(matcher.group(0) + "\n");
-
-				String[] groups = new String[matcher.groupCount()];
-				for (int j = 1; j <= matcher.groupCount(); j++) {
-					String s = matcher.group(j);
-					groups[j - 1] = s;
-				}
-
-				model.addRow(groups);
+			// work out which flags are being used
+			if ((flagsMask & Pattern.DOTALL) == Pattern.DOTALL) {
+				flags.append("DOTALL ");
+				dotall = true;
 			}
-		}
 
-		txtOutput.setText("");
-		txtOutput.append("Matched " + numMatches + " line(s) out of "
-				+ input.length + " line(s) of input.");
+			if ((flagsMask & Pattern.MULTILINE) == Pattern.MULTILINE) {
+				flags.append("MULTILINE ");
+			}
+
+			if ((flagsMask & Pattern.CASE_INSENSITIVE) == Pattern.CASE_INSENSITIVE) {
+				flags.append("CASE_INSENSITIVE ");
+			}
+
+			DefaultTableModel model = new DefaultTableModel();
+			jTable.setModel(model);
+
+			int numMatches = 0;
+
+			// it DOTALL mode is on then grab the entire text rather then seperating by line
+			if (dotall) {
+				input = new String[1];
+				input[0] = text;
+			} else {
+				input = text.split("\n");
+			}
+
+			
+			for (String line : input) {
+				Matcher matcher = pattern.matcher(line);
+				while (matcher.find()) {
+
+					numMatches++;
+
+					int groupCount = matcher.groupCount();
+
+					model.setColumnCount(groupCount);
+
+					Object[] headers = new Object[groupCount];
+
+					for (int k = 0; k < groupCount; k++) {
+						headers[k] = k + 1;
+					}
+
+					model.setColumnIdentifiers(headers);
+
+					txtOutput.append(matcher.group(0) + "\n");
+
+					String[] groups = new String[matcher.groupCount()];
+					for (int j = 1; j <= matcher.groupCount(); j++) {
+						String s = matcher.group(j);
+						groups[j - 1] = s;
+					}
+
+					model.addRow(groups);
+				}
+			}
+
+			txtOutput.setText("");
+			txtOutput.append("Matched " + numMatches + " line(s) out of "
+					+ input.length + " line(s) of input.");
+
+			if (!flags.toString().isEmpty()) {
+				txtOutput.append("\n\nFlags: " + flags.toString().trim());
+			}
+
+		} catch (PatternSyntaxException ex) {
+			txtOutput.setText("");
+			txtOutput.append("Error in expression\n\n");
+			txtOutput.append(ex.getMessage());
+		}
 	}
 
 	private void format() {