str="""this is some text
Text@7789347: 4444
some text
text @ 7789348 : 666,555
some text
"""
puts str.scan(/(?mi)^\s*\btext\b.*?@\s*(\d+(?:,\d+)?)\s*:\s*(\d+(?:,\d+)?)$/)
c3RyPSIiInRoaXMgaXMgc29tZSB0ZXh0CgpUZXh0QDc3ODkzNDc6IDQ0NDQKc29tZSB0ZXh0IAogIHRleHQgICBAIDc3ODkzNDggOiA2NjYsNTU1CnNvbWUgdGV4dAoiIiIKCnB1dHMgc3RyLnNjYW4oLyg/bWkpXlxzKlxidGV4dFxiLio/QFxzKihcZCsoPzosXGQrKT8pXHMqOlxzKihcZCsoPzosXGQrKT8pJC8pCgo=