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shravani milshravani mil 

List index out of bound 1 error

list out of bond error at line 

 String userId = leadUsrStr.split('_')[1];
sandeep@Salesforcesandeep@Salesforce
Please apply contains to check '_' is contained by this leadUsrStr or not ? and then also check list size.

Thanks
Sandeep Singhal
http://www.codespokes.com/
shravani milshravani mil
didnt get you sandeep
Rahul SharmaRahul Sharma
Just thought to elaborate Sandeep's post with some code, it is as follows:
  
String leadUsrStr = 'your string with a User Id';
Id userId;

// check if the leadUsrStr is not empty and contains an "_"
if(String.isNotEmpty(leadUsrStr) && leadUsrStr.contains('_')) {
    // fetch the second value based on an underscore
    String strUserId = leadUsrStr.split('_')[1]; 

    // try catch to validate if the its a valid Salesforce Id
    try {
        strUserId = String.isNotEmpty(strUserId) ? strUserId.trim() : null;
        
        // check  if the Id is a valid User Id by comparing the prefix
        if(strUserId.length() > 0 &&
            User.sObjectType.getDescribe().getKeyPrefix() == strUserId.substring(0,3)) {
            userId = strUserId;
        }
    } catch(Exception objEx) {
        // some exception handling, if you'd like to
        System.debug('Invalid Id: ' + strUserId);
    }
}

System.debug('valid userId is: ' + userId);

Hope it helps and let us know in case of issues.
Request you to invest more time on understanding the error yourself first :)