php - How to make part of regex pattern optional? -

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im working regex pattern:

|img_class.*?<img src="(.*?)"(.*?)<\/td>|ms

but want make <img src="(.*?)" optional (not src part), because img_class td empty , when pattern fails.

i tried |img_class.*?(<img src="(.*?)")?(.*?)<\/td>|ms never match.

(i know use xpath or better im using pretty big class , dont want recode right now).

|img_class.*?(?:<img src="(.*?)")?(.*?)<\/td>|ms

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