Is there any XPath expression for String Padding in wso2 ESB?

Question

I have enabled XPath 2.0 configuration synapse.xpath.dom.failover.enabled=true in synapse.properties but still unable to get string padding done. I

Answer 1

This can be achieved using XPath 1.0 like so, assuming that "WSO2" will be replaced by dynamic input string in the actual implementation :

substring(concat('WSO2', '%%%%%%%%%%'), 1, 10)

The above XPath basically works by concatenating string of 10 specific for-padding characters to the original input string, and then substring the result to get only the first 10 characters. Found this trick in the following XSL question : XSL left-right justification with Padding

To put this in a more generic formula :

substring(concat('input_string', '%%%%....'), 1, n)

• input_string : string to which padding operation will applied
• % : character used for padding, repeated n times
• n : fixed number of characters expected in the output string