Does anyone know why a lookahead such as the following causes a dashboard panel to hang with "waiting for data", but works perfectly when run in an independent search? rex field=foo "(?=\w+$)(?P<bar>\w+$)" Stranger still - if the rex command is ``` commented out ```, the issue continues to occur. For context, the panel is a tabular drilldown panel that uses a boolean token to display on/off, and two tokens for earliest and latest values, based on the selected "row" of a column chart using $row._time and relative_time($row._time$, "+1h"). The panel displays without issue when the rex is removed. Other rex commands work without issue. The solution in this case was to remove the lookahead entirely. However, given the status of "waiting for data", does anyone know the cause (and thus ways to avoid this issue in general)?
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