If it was in my lawn and garden - quackgrass would be my guess.
It is a grass like the Kentucky Bluegrass and Fescue in my lawn, a perennial. I could kill all three of them with an herbicide but there isn't an herbicide that will kill one grass and leave the others, that I'm aware of.
If it's quackgrass, it has rhizomes and those will have to be removed or those "underground stems" will grow another plant.
What I would do is use a spading fork to loosen the soil. In the garden, I can then use a long-handled cultivator to flip the plant out of the loose soil. In the lawn, I would be interested in leaving as much of the lawn grass as possible while not breaking and leaving any of those pesky quackgrass rhizomes. So, I would be sitting on a stool with a short three-prong cultivator working the weeds out.
Here's Wishing You, Good Luck.
Make everything as simple as possible but not simpler. ~ Albert Einstein