import re
string = """
aaa 
 
aaa "word" --sdsdrrr2 --sds {
 
test test 
}
 
aaa "word2" --sdsdd sdsd {
 
    fffsd
    ssss
}
 
aaa "word3" -sdksdld sdsd
 
{
 
    sdsdd
    sdsddd
    sdsdddd }
"""
 
rx = re.compile("""
^(?=.*"word2") # ^ - start of the line with pos. lookahead
[^{]+        # anything not a {
{[^}]+}      # followed by {, anything in between and a closing }
""", re.MULTILINE|re.VERBOSE)
 
matches = rx.findall(string)
print matches

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