Convert text to JSON via regular expression.
tojson REGEX
Take input text from STDIN and convert it to JSON via the given Python regular expression REGEX. Each line of the input is searched for the first match of the regular expression and converted to a JSON object using names of the capturing groups as keys, and their corresponding captures as values. Unnamed capturing groups and groups that did not match are ignored. Each input line is stripped of any trailing whitespace before applying REGEX. Output always goes to STDOUT.
By default, in each output object all values are JSON strings, unless the capturing group name has "__N" suffix, in which case the program makes an attempt to convert the value to a JSON number, or "__B" suffix to convert the value to JSON "true" or "false". In either case, the suffix is removed from the key, and failed conversions leave values as strings. The boolean conversion treats strings like "true" or "yes" as JSON "true", and strings like "false" and "no" as JSON "false", case-insensitive.
Typical use cases include parsing plain text log files or Unix commands output to extract useful information and convert it to JSON for further processing.
▶ ps -u root -o pid,%cpu,%mem,args \
| tojson '^\s*(?P<pid__N>\d+)\s+(?P<cpu__N>\d+\.\d+)\s+(?P<mem__N>\d+\.\d+)\s+(?P<cmd>[^[].+)$'Output:
[ {"cmd": "/sbin/init splash", "pid": 1, "cpu": 0.0, "mem": 0.1}
, {"cmd": "/lib/systemd/systemd-journald", "pid": 517, "cpu": 0.0, "mem": 0.2}
, {"cmd": "bpfilter_umh", "pid": 543, "cpu": 0.0, "mem": 0.0}
, {"cmd": "/lib/systemd/systemd-udevd", "pid": 554, "cpu": 0.0, "mem": 0.0}
, {"cmd": "/usr/lib/accountsservice/accounts-daemon", "pid": 809, "cpu": 0.0, "mem": 0.1}
, {"cmd": "/usr/sbin/acpid", "pid": 811, "cpu": 0.0, "mem": 0.0}
...
]Just copy tojson file to a directory included in the $PATH environment variable.
Tested on Linux Mint 20.1 with Python 3.8.5.