import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "IF NOT EXISTS \\(SELECT \\* FROM sys\\.objects WHERE object_id = OBJECT_ID\\(N'\\[(.*?)\\]\\.\\[(.*?)\\]'\\) AND type = 'D'\\)\n"
+ "BEGIN\n"
+ "ALTER TABLE \\[(.*?)\\]\\.\\[(.*?)\\] ADD DEFAULT \\(\\((.*?)\\)\\) FOR \\[(.*?)\\]";
final String string = "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF_EnrollmentPeriod_MedPlans_IsActive]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[EnrollmentPeriod_MedPlans] ADD CONSTRAINT [DF_EnrollmentPeriod_MedPlans_IsActive] DEFAULT ((0)) FOR [IsActive]\n"
+ "END\n\n"
+ "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF__HourlyUsa__12:00__3EFC4F81]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[HourlyUsageHistory] ADD DEFAULT ((0)) FOR [12:00 AM]\n"
+ "END\n\n"
+ "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF__HourlyUsa__1:00 __3FF073BA]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[HourlyUsageHistory] ADD DEFAULT ((0)) FOR [1:00 AM]\n"
+ "END\n\n"
+ "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF__HourlyUsa__2:00 __40E497F3]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[HourlyUsageHistory] ADD DEFAULT ((0)) FOR [2:00 AM]\n"
+ "END\n\n"
+ "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF__HourlyUsa__3:00 __41D8BC2C]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[HourlyUsageHistory] ADD DEFAULT ((0)) FOR [3:00 AM]\n"
+ "END\n\n"
+ "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF__HourlyUsa__4:00 __42CCE065]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[HourlyUsageHistory] ADD DEFAULT ((0)) FOR [4:00 AM]\n"
+ "END\n\n"
+ "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF__HourlyUsa__5:00 __43C1049E]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[HourlyUsageHistory] ADD DEFAULT ((0)) FOR [5:00 AM]\n"
+ "END\n\n"
+ "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF__HourlyUsa__6:00 __44B528D7]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[HourlyUsageHistory] ADD DEFAULT ((0)) FOR [6:00 AM]\n"
+ "END\n\n"
+ "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF__HourlyUsa__7:00 __45A94D10]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[HourlyUsageHistory] ADD DEFAULT ((0)) FOR [7:00 AM]\n"
+ "END\n\n"
+ "GO\n"
+ "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DF__HourlyUsa__8:00 __469D7149]') AND type = 'D')\n"
+ "BEGIN\n"
+ "ALTER TABLE [dbo].[HourlyUsageHistory] ADD DEFAULT ((0)) FOR [8:00 AM]\n"
+ "END\n";
final String subst = "IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[\\1].[\\2]') AND type = 'D')BEGINALTER TABLE [\\3].[\\4] ADD CONSTRAINT [\\2] DEFAULT ((\\5)) FOR [\\6]";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
// The substituted value will be contained in the result variable
final String result = matcher.replaceAll(subst);
System.out.println("Substitution result: " + result);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html