How to truncate values on PO ADF page expresssion language ?

Summary

We are using PO approval page as ADF page and want to TRUNCATE PO charge account value . How to truncate it ?

Content

We are using PO approval page as ADF page and want to TRUNCATE PO charge account value . How to truncate it ?
Currently below expression is in use :

#{row.bindings.ChargeAccount.inputValue !='Multiple' ? row.bindings.ChargeAccount.inputValue : prcponotificationpublicuiBundle4['OText.Multiple1']}

Current charge account value : 1011.11.1011.5055.12345.7777777.9999.9999.9999.9999.9999

We want to remove 9999 from last 5 segements and to be value should be 1011.11.1011.5055.12345.7777777

How to modify this ADF expression ?