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segmentA {
   content Aa
   content Ab
   content Ac
    ....
}

segmentB {
   content Ba
   content Bb
   content Bc
   ......
}

segmentC {
  content Ca
  content Cb
  content Cc
  ......
}

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def SearchStuff(lines,sstr):
    i=0
    while(lines[i]!='}'):
        #Suche einen bestimmten String in den lines. Z.b: nach dem String "Ca"  
         if 'Ca' in lines[i]:
            return lines[i]
         i+=1

def main(search_str):
    f=open('file.txt','r')
    lines = f.readlines()
    f.close()
    for line in lines:
        if search_str in line:
            index = lines.index(line)
            break
    lines = lines[index+1:]
    print SearchStuff(lines,search_str) 

search_str = 'segmentC {'   
main(search_str)

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segment C {
 content Ca\something_ABC\something_EFG\
 content Ca\something_XYZ\something_UVW\
 content Cc\
}

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def wanted_lines(fp, search_text, start_marker, end_marker='}'):
    wanted = False
    for line in fp:
        line = line.rstrip()  # das könnte man auch noch in einen Generator eine Zeile höher packen
        if line == start_marker:
            wanted = True
        elif line == end_marker:
            wanted = False
        else:
            if wanted and search_text in line:
                yield line


def main():
    start_text = 'segment C {'
    end_text = '}'
    search_text = 'Ca'

    with open('file.txt', 'r') as fp:
        for line in wanted_lines(fp, search_text, start_text, end_text):
            print(line)


if __name__ == '__main__':
    main()

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TEST_TEXT = """\
segmentA {
   content Aa
   content Ab
   content Ac
    ....
}
 
segmentB {
   content Ba
   content Bb
   content Bc
   ......
}
 
segmentC {
  content Ca
  content Cb
  content Cc
  ......
}"""

def search(lines, section_name, text, start_mark='{', end_mark='}'):
    inside_section = False
    for line in lines:
        line = line.strip()
        if line.endswith(start_mark):
            current_section = line.rstrip(start_mark).strip()
            if current_section == section_name:
                inside_section = True
        elif line == end_mark:
            inside_section = False
        elif inside_section and text in line:
            return line


def main():
    lines = TEST_TEXT.splitlines()
    print(search(lines, 'segmentC', 'Cb'))


if __name__ == '__main__':
    main()

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>>> x = """
a
b
c"""
>>> x
'\na\nb\nc'
>>> x = """\
a
b
c"""
>>> x
'a\nb\nc'

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import xml.etree.ElementTree as ET

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    start_text = 'source_code_includes {'
    search_text = '\\Algorithm'

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search_text = '\\Algorithm', '\\Libraries'

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any(needle in line for needle in search_text)

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if wanted and any(s in line for s in search_texts):

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import re
with open("input_file.txt", "r") as infile, open("output_file.txt", 'w') as outfile: 

	for result in re.findall('source_code_includes(.*?)\}', infile.read(), re.S):
		for line in result.split('\n'):
			if re.search('(Algorithm|Libraries)', line):
				outfile.write(line + '\n')