Use a post-emergent herbicide, but VERIFY IT WILL NOT KILL THE TYPE OF GRASS AROUND THE WEED aka “Floratam” St Augustine. However, this crab grass here (planted as "lawns") is very sensitive to "safe to use" stuff, if applied too concentrated.
Maybe this would work... 3 Way Max Turf and Ornamental Broadleaf Herbicide
domyown {dot} com/way-max-turf-and-ornamental-broadleaf-herbicide-p-9853.html
For the broad spectrum, kill it all, approach... There are 2 types of weed killer actions.
Roundup equivalents work for a short time, a day or so, because their active ingredient is broken down by sunlight. It absorbs into the week and fills to the root. This is what you use around other vegetation.
Veg killer type are long acting. Kills now and remains in the soil active for months. This is what you use in driveway cracks.
Never simply pull it out. Pieces of root break off and remain alive in the soil and will regrow rapidly. That become a full time, never ending job. Weed killer first, wait, then pull the dead remains.
A good trick when spraying is to surround the weed with a cardboard "wall" to prevent over spray.
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