'Regex Patternst Match Wrong Strings

There is my regex

\[a:section(.*)\](.*)\[\/a:section\]

I wanna detect like this

Group1 : asasasas   
Group2 : [a:widget type=blog][a:widget type=blog][a:widget type=blog]

But my regex code match wrong, How can I fix it?

Edit : If I don't use "[" string in group2, It works what I want.

regex

Sources

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