Need a little regex help with look ahead (I think) Trying to get all numbers up to an underscore "_" for ex 146973095502995_234698373397133 So hoping to get 146973095502995_ or better yet 146973095502995 AND Then would also need the regex to match all characters after the underscore "_" _234698373397133 or better yet 234698373397133 best ive came up with is ^[a-zA-Z0-9_]+$ but that just gets the entire string Thanks for reading