import re
Text = 'LD(_030S.F.IN)OR(_080T_SAF_OUT)COIL(xxSF[4].Flt[120].0)'
m = re.search(r'(?:OR|LD)\([^()]*\)COIL\(xxSF\[\d]\.Flt\[\d+]\.\d+', Text)
if m:
print(m.group())
aW1wb3J0IHJlClRleHQgPSAnTEQoXzAzMFMuRi5JTilPUihfMDgwVF9TQUZfT1VUKUNPSUwoeHhTRls0XS5GbHRbMTIwXS4wKScKbSA9IHJlLnNlYXJjaChyJyg/Ok9SfExEKVwoW14oKV0qXClDT0lMXCh4eFNGXFtcZF1cLkZsdFxbXGQrXVwuXGQrJywgVGV4dCkKaWYgbToKCXByaW50KG0uZ3JvdXAoKSk=