with Paul2032, Flower? Color? Where you live? ...Oxalis or Sorrel grows from bulblets; to rid your grass of it with a new lawn, you are going to have to be persistent with removal making sure, when you pull it, you get the bulblets and all of the root system of each sprout. Also when you pull them, if they have seed pods, put them directly from the ground to a close in proximity plastic bag 
Be Gentile With Them dont let them touch the ground again or shake the abundance of seeds back to the ground, so keep the bag close to the plant when you up root it. This can run a few seasons, but you need to be on it and persistent or it can take over areas of your new grass. My second thought would be to forego a lawn this year and smother them with black poly plastic and a granular pre emergent herbicide to kill any remaining seeds...otherwise, happy
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