extract lines with regexp

[Sebastien LE MAGUER <Sebastien.Le_maguer@irisa.fr>]

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Hi,

I wonder how to extract lines using a regexp. My file contains something 
like that :

<useless lines>
<line X>
theq() :
<useless lines>

and I want to extract all lines before theq (here line X)

does anyone have an idea ?

Thanks

Sebastien

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