regex - Getting JSON value from JSON String using Shell Script -


i have json string:

{"name":"http://someurl/ws/someid","id":"someid"}

i want value "id" key , store in variable. succesfully tried using jq. due constraints, need achieve using grep , string matching.

i tried far: grep -po '"id":.*?[^\\]"'; giving "id":"ws-4c906698-03a2-49c3-8b3e-dea829c7fdbe" output. need id value. please help

with pcre regex, may use lookarounds. thus, need put "id":" positive lookbehind construct, , match 1 or more chars other ":

grep -po '(?<="id":")[^"]+'

where

  • (?<="id":") - requires "id":" appear left of current position (but matched text not added match value) and
  • [^"]+ - matches , adds match 1 or more chars other ".

to values escaped quotes:

grep -po '(?<="id":")[^"\\]*(?:\\.[^"\\]*)*'

here, (?<="id":") still match position right after "id":" , following matched:

  • [^"\\]* - 0 or more chars other " , \
  • (?:\\.[^"\\]*)* - 0 or more consequent sequences of:
    • \\. - \ , char (any escape sequence)
    • [^"\\]* - 0 or more chars other " , \

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