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We have fixed the issue in the latest version of InDesign, Id 14.0.3
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https://helpx.adobe.com/indesign/kb/fixed-issues.htmlChristopher supported this idea ·Christopher commented
I still have the problem in 14.0.3 Mac, in newly created documents. If the grep match is after 50,000 chars it will not be found, unless it also occurs before 50,000 - then both occourances will be found.
I went back to v 14.0 and the grep works well.