linux - Extract string following another string in bash? -



linux - Extract string following another string in bash? -

i have next string:

[1360308597] service notification: qreda;demo-jms2;outconnectorresponse;notify-service-by-email;critical consumercount=0[1360308817] service notification: qreda;demo-jms2;disk space;critical;notify-service-by-email;disk critical - free space: /data 3018 mb (10% inode=92%):

in above string want extract string next demo-jms2. here demo-jms2 occurs twice. want words next demo-jms2 reply should outconnectorresponse , disk space.

what want positive look-behind:

$ grep -po '(?<=demo-jms2;)[^;]+' file outconnectorresponse disk space

options:

-p, --perl-regexp pattern perl regular expression

-o, --only-matching show part of line matching pattern

explanation:

(?<=demo-jms2;) # positive lookbehind: match follow after literal demo-jms2; [^;]+ # match 1 or more non ; characters

edit:

to filter duplicates results pipe through sort -u:

$ grep -po '(?<=demo-jms2;)[^;]+' file outconnectorresponse disk space outconnectorresponse disk space $ grep -po '(?<=demo-jms2;)[^;]+' file | sort -u disk space outconnectorresponse

linux bash grep design-patterns

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