[SalesForce] How to replace all {!XXX} from string

The option to replace case insensitive regex in java is Pattern.CASE_INSENSITIVE, which can also be specified as (?i)

(http://boards.developerforce.com/t5/Apex-Code-Development/Why-Pattern-CASE-INSENSITIVE-not-detectable/td-p/204337)

String srcStr = '{!id} value {!Id} is not {!ID}';
String replaceToken = '(?i)\\{!id\\}';
System.debug('REPLACEMENT ' + srcStr.replaceAll(replaceToken, ''));
System.assertEquals('  value  is not ', srcStr.replaceAll(replaceToken, ''));

The code below will get all the current picklist values from the Solution_Interest_s__c and also add one more value called My Label

public List<SelectOption> solutionInterestOptions {
    get {
        if (solutionInterestOptions == null) {
            solutionInterestOptions = new List<SelectOption>();
            Schema.DescribeFieldResult r = Lead.Solution_Interest_s__c.getDescribe();
            for (Schema.PicklistEntry pr : r.getPicklistValues()) {
                solutionInterestOptions.add(new SelectOption(pr.getValue(), pr.getLabel()));
            }

            // Do this as many times as needed
            solutionInterestOptions.add(new SelectOption('MyValue', 'My Label'));
        }
        return solutionInterestOptions;
    }
    set;
}

You can access the solutionInterestOptions in the VF page as follows:

<apex:pageBlockSectionItem >
    <apex:outputLabel value="Solution Interest"/>
    <apex:selectList value="{!lead.Solution_Interest_s__c}">
        <apex:selectOptions value="{!solutionInterestOptions}"/>
    </apex:selectList> 
</apex:pageBlockSectionItem>