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

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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

^"[^"]+",

regular expression visualization

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)) ----------------------------------------------------------------------   ,                        ',' ----------------------------------------------------------------------

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