import re
content = "abc/def/efg 212 234 asjakj"
match = re.search('^[^\s/]+', content, flags = re.M)
if match:
content_new = match.group()
print(content_new)
aW1wb3J0IHJlCmNvbnRlbnQgPSAiYWJjL2RlZi9lZmcgMjEyIDIzNCBhc2pha2oiCm1hdGNoID0gcmUuc2VhcmNoKCdeW15ccy9dKycsIGNvbnRlbnQsIGZsYWdzID0gcmUuTSkKaWYgbWF0Y2g6CiAgICBjb250ZW50X25ldyA9IG1hdGNoLmdyb3VwKCkKcHJpbnQoY29udGVudF9uZXcp