java - check for a substring in a string before the first comma -

i have set of strings separated , example:

abc,defg,ijkl  pqrs,tu,vv  ,klmnop,qwe  aamn,nn,khhk 

as can see, third line doesn't start substring. starts comma.

using regex how can tell string starts substring of random length before first comma.

description

^"[^"]+", 

this regular expression following:

• verifies string starts substring
• requires substring random length greater zero

example

live demo

https://regex101.com/r/ke3bg5/1

sample text

abc,defg,ijkl pqrs,tu,vv ,klmnop,qwe aamn,nn,khhk 

sample matches

abc, pqrs, aamn, 

explanation

node                     explanation ----------------------------------------------------------------------   ^                        beginning of "line" ----------------------------------------------------------------------   [^,]+                    character except: ',' (1 or more times                            (matching amount possible)) ----------------------------------------------------------------------   ,                        ',' ----------------------------------------------------------------------