<apex:pageBlock title="LeadDetail">

         <apex:pageBlockButtons location="top">
        <apex:commandButton value="Search" action="{!Search}" />
        <apex:commandButton value="Create" action="{!save}"/>
        </apex:pageBlockButtons>         

        <apex:pageBlockSection >
            <apex:pageBlockSectionItem >
            <apex:outputlabel value="Last Name" for="rep"/>
            <apex:inputField id="rep" value="{!newlead.lastname}" />
        </apex:pageBlockSectionItem>  
            <apex:inputField value="{!lead.company}" rendered="{!showmsg }"/>
            <apex:inputField value="{!lead.status}" rendered="{!showmsg }"/> 

      </apex:pageBlockSection>


     <apex:pageBlock title="Duplicate Records" rendered="{!hasDuplicateResult}">
        <apex:pageMessages />
        <apex:outputPanel layout="block" style="overflow:auto;width:750px;height:250px" >

        <apex:pageblocksection >

        <apex:pageblockTable value="{!test}" var="ac" columns="2" rendered="{!showmsg}">

<apex:column >
                <apex:facet name="header">Name</apex:facet>
               <apex:outputText value="{!ac.name}"></apex:outputText>
            </apex:column> 

           <apex:column >
           <apex:facet name="header">Status                         
                </apex:facet>
                <apex:outputText value="{!ac.status}"></apex:outputText>
           </apex:column>

public class accountDedupeController {


 Private final Lead led;
 public lead newlead{get;set;}
public accountDedupeController(ApexPages.StandardController stdController) {
    this.led = (Lead)stdController.getRecord();
    showmsg = false;
    system.debug('3333333333333'+led.Lastname);
}
Public boolean showmsg{get;set;}    

public list<lead> test{get;set;}

public pagereference search(){
    system.debug('3333333333333'+led.Lastname);
    showmsg = true;
    string query;
    query = 'select id, name, firstname,lastname, status from lead where lastname like'+ '\'%'+ led.Lastname +'%\'';

    test= database.query(query);
    system.debug('22222222222'+query);
    system.debug('111111'+test+test.size());

    return null;
}

// Initialize a variable to hold the account record you're processing
private final lead lead;

// Initialize a list to hold any duplicate records
private List<sObject> duplicateRecords;

// Define variable that’s true if there are duplicate records
public boolean hasDuplicateResult{get;set;}

// Define the constructor
public accountDedupeController() {

    // Define the values for the account you’re processing based on its ID
    Id id = ApexPages.currentPage().getParameters().get('id');
    this.lead = (id == null) ? new lead() : 
        [SELECT Id, Name
         FROM Lead WHERE Id = :id];

    // Initialize empty list of potential duplicate records
    this.duplicateRecords = new List<sObject>();
    this.hasDuplicateResult = false;
}



 // Return account and its values to the Visualforce page for display
   public lead getlead() {
        return this.lead;
    }

    // Return duplicate records to the Visualforce page for display
    public List<sObject> getDuplicateRecords() {
        return this.duplicateRecords;
    }

// Process the saved record and handle any duplicates
public PageReference save() {

    // Optionally, set DML options here, use “DML” instead of “false” 
    //   in the insert()
     Database.DMLOptions dml = new Database.DMLOptions(); 
     dml.DuplicateRuleHeader.allowSave = true;
     dml.DuplicateRuleHeader.includeRecordDetails = true;
     dml.DuplicateRuleHeader.runsAsCurrentUser = true;
    Database.SaveResult saveResult = Database.insert(lead, false);

    if (!saveResult.isSuccess()) {
        for (Database.Error error : saveResult.getErrors()) {
            // If there are duplicates, an error occurs
            // Process only duplicates and not other errors 
            //   (e.g., validation errors)
            if (error instanceof Database.DuplicateError) {
                // Handle the duplicate error by first casting it as a 
                //   DuplicateError class
                // This lets you use methods of that class 
                //  (e.g., getDuplicateResult())
                Database.DuplicateError duplicateError = 
                        (Database.DuplicateError)error;
                Datacloud.DuplicateResult duplicateResult = 
                        duplicateError.getDuplicateResult();

                // Display duplicate error message as defined in the duplicate rule
                ApexPages.Message errorMessage = new ApexPages.Message(
                        ApexPages.Severity.ERROR, 'Duplicate Error: ' + 
                        duplicateResult.getErrorMessage());
                ApexPages.addMessage(errorMessage);

                // Get duplicate records
                this.duplicateRecords = new List<sObject>();

                // Return only match results of matching rules that 
                //  find duplicate records
                Datacloud.MatchResult[] matchResults = 
                        duplicateResult.getMatchResults();

                // Just grab first match result (which contains the 
                //   duplicate record found and other match info)
                Datacloud.MatchResult matchResult = matchResults[0];

                Datacloud.MatchRecord[] matchRecords = matchResult.getMatchRecords();

                // Add matched record to the duplicate records variable
                for (Datacloud.MatchRecord matchRecord : matchRecords) {
                    System.debug('MatchRecord: ' + matchRecord.getRecord());
                    this.duplicateRecords.add(matchRecord.getRecord());
                }
                this.hasDuplicateResult = !this.duplicateRecords.isEmpty();
            }
        }

        //If there’s a duplicate record, stay on the page
        return null;
    }

    //  After save, navigate to the view page:
    return (new ApexPages.StandardController(lead)).view();
    }

}