regex - How to match a field in the middle or the end of a line with separators? -

sorry title, don't know how explain problem in 1 sentence.

i'm trying match field in log don't know if it's in middle of line or @ end of it.

example 3 lines:

b=this short sentence c=see a=hello world c=see b=this short sentence a=hello world a=hello world b=this short sentence c=see

i'd value of "c" field (see soon). problem last line, there no separator @ end of string.

this tried.

this 1 doesn't match last line it's last field:

c=([^=]+) \w+=

this 1 works looks over-complicated:

c=([^=]+)(?: \w+=|$)

how this?

you regex fine, have simplified beginning:

c=.*?($|\n|(\w=))

ITEMscalal