How to evaluate if a value is in Seconds and only then convert to Miliseconds

[TotallyJuvenile]

I am trying to parse some data for API latency. I have a value for "elapsedTime" which spits that out. However if a request takes longer than 999ms, then it changes to reporting in seconds. So... the query below could return 999ms or 1.001s. What eval statement do I need here to parse the value of elapsedTime and if it contains "s" and not "ms",  then * 1000 to get a value in ms...

| NEED SOME EVAL HERE I GUESS | stats min(elapsedTime) as Fastest max(elapsedTime) as Slowest avg(elapsedTime) as "Average"

[bowesmana]

Simple way is to first extract the numeric value and the time specifier, then use eval to do the test/calc

| rex field=elapsedTime "(?<timeValue>[\d\.]*)(?<timeSpecifier>(ms|s))"
| eval elapsedTime=if(timeSpecifier="ms", timeValue, timeValue*1000)