Retrieve matching element from string

Question

Using bash I have a string that holds my deployed applications:

APPS="myapp-a-1.0.war myapp-b-1.1.war myapp-c-1.2-SNAPSHOT.war"

I can determine whether a specific app is deployed:

if [[ "$APPS" == *myapp-a* ]]
then
    echo "myapp-a is deployed, but we don't know the version."
fi

How can I retrieve the complete matching word (application with version) given that I only have the words prefix (application name, e.g. 'myapp-a')?

R Samuel Klatchko · Accepted Answer · 2012-10-05 06:56:52Z

1

You can loop over your variable (provided you don't quote it):

for app in ${APPS}; do
  if [[ "${app}" == myapp-a* ]]; then
    echo ${app}
  fi
done

answered Oct 5, 2012 at 6:56

R Samuel Klatchko

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Comments

score 1 · Accepted Answer · 2012-10-05 10:17:45Z

1

as simple as:

if [[ "$APPS" =~ myapp\-a([^war]*)war ]]; then
  echo "${BASH_REMATCH[0]} deployed"
fi

result in:

myapp-a-1.0.war deployed

if you need only version:

if [[ "$APPS" =~ myapp\-a([^war]*)war ]]; then
  echo "${BASH_REMATCH[1]} deployed"
fi

result in:

-1.0. deployed

if you need version without artefacts like dashes, dots:

if [[ "$APPS" =~ myapp\-a\-([^war]*)\.war ]]; then
  echo "${BASH_REMATCH[1]} deployed"
fi

result in:

1.0 deployed

answered Oct 5, 2012 at 9:52

user904990

Thanks. These are great examples provided.