CODEWITHSUNDEEP
regexbashsed
Bilow Yuriy
Bilow Yuriy

Reputation: 1319

Getting defined substring with help of sed or egrep

Everyone!! I want to get specific substring from stdout of command.
stdout:

{"response": {"id":"110200dev1","success":"true","token":"09ad7cc7da1db13334281b84f2a8fa54"},"success":"true"}

I need to get a hex string after token without quotation marks, the length of hex string is 32 letters.I suppose it can be done by sed or egrep. I don't want to use awk here. Because the stdout is being changed very often.

Upvotes: 2

Views: 339

Answers (4)

NeronLeVelu
NeronLeVelu

Reputation: 10039

YourStreamOrFile | sed -n 's/.*"token":"\([a-f0-9]\{32\}\)".*/\1/p'

doesn not return a full string if not corresponding

Upvotes: 1

hwnd
hwnd

Reputation: 70732

grep's nature is extracting things:

grep -Po '"token":"\K[^"]+'
  • -P option interprets the pattern as a Perl regular expression.
  • -o option shows only the matching part that matches the pattern.
  • \K throws away everything that it has matched up to that point.

Or an option using sed...

sed 's/.*"token":"\([^"]*\)".*/\1/'

Upvotes: 4

Cyrus
Cyrus

Reputation: 88654

With sed:

your-command | sed 's/.*"token":"\([^"]*\)".*/\1/'

Upvotes: 2

anubhava
anubhava

Reputation: 785276

This is an alternate gnu-awk solution when grep -P isn't available:

awk -F: '{gsub(/"/, "")} NF==2&&$1=="token"{print $2}' RS='[{},]' <<< "$string"
09ad7cc7da1db13334281b84f2a8fa54

Upvotes: 4

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