Regex start matching from last occurence -

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i have html code:

<a href="localhost/1153,test">  <img src="test.jpg"> (...) <a href="localhost/1191,test8">  <img src="test2.jpg"> (...) <a href="localhost/9838,test">  <img src="13.gif"> (...)

want match value before gif, in example 9838. no matter how try, end first match (1153). how match "backwards" known pattern?

\d*(?=,.*\.gif)

this matches first occurence of digits before 

[comma][other text][.gif]

you can test here.


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