Revisions to Regex to extract DKIM record from file

OCD

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edited Feb 8, 2023 at 21:32

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Assuming GNU grep, I would pick out the quoted strings and then join them together

grep -oP '".*?"' file | tr -d '\n' | sed 's/" *"//g'; echo

Result from your example (shortened for brevity)

"v=DKIM1; h=sha256; k=rsa; t=y; p=MIGfMA0GCSqG…QAB"

Alternatively you could use perl,

perl -e '
    $_ = join(" ", (map {chomp; $_} <>));    # Read and join lines
    s/^.*?(".*").*$/$1/;                      # Strip leading and trailing text outside quoted strings
    s/"\s*"/ /g;                              # Merge adjacent quoted strings
    s/\s\s+/ /g;                              # Reduce multiple spaces to one
    print                                     # Output the result
' file

Assuming GNU grep, I would pick out the quoted strings and then join them together

grep -oP '".*?"' file | tr -d '\n' | sed 's/" *"//g'; echo

Result from your example (shortened for brevity)

"v=DKIM1; h=sha256; k=rsa; t=y; p=MIGfMA0GCSqG…QAB"

Alternatively you could use perl,

perl -e '
    $_ = join(" ", (map {chomp; $_} <>));    # Read and join lines
    s/^.*?(".*").*$/$1/;                      # Strip leading and trailing text outside quoted strings
    s/"\s*"/ /g;                              # Merge adjacent quoted strings
    s/\s\s+/ /g;                              # Reduce multiple spaces to one
    print                                     # Output the result
' file

Assuming GNU grep, I would pick out the quoted strings and then join them together

grep -oP '".*?"' file | tr -d '\n' | sed 's/" *"//g'; echo

Result from your example (shortened for brevity)

"v=DKIM1; h=sha256; k=rsa; t=y; p=MIGfMA0GCSqG…QAB"

Alternatively you could use perl,

perl -e '
    $_ = join(" ", (map {chomp; $_} <>));    # Read and join lines
    s/^.*?(".*").*$/$1/;                     # Strip leading and trailing text outside quoted strings
    s/"\s*"/ /g;                             # Merge adjacent quoted strings
    s/\s\s+/ /g;                             # Reduce multiple spaces to one
    print                                    # Output the result
' file

Perl too

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edited Feb 8, 2023 at 19:13

Chris Davies

128k
16
178
323

Assuming GNU grep, I would pick out the quoted strings and then join them together

grep -oP '".*?"' file | tr -d '\n' | sed 's/" *"//g'; echo

Result from your example (shortened for brevity)

"v=DKIM1; h=sha256; k=rsa; t=y; p=MIGfMA0GCSqG…QAB"

Alternatively you could use perl,

perl -e '
    $_ = join(" ", (map {chomp; $_} <>));    # Read and join lines
    s/^.*?(".*").*$/$1/;                      # Strip leading and trailing text outside quoted strings
    s/"\s*"/ /g;                              # Merge adjacent quoted strings
    s/\s\s+/ /g;                              # Reduce multiple spaces to one
    print                                     # Output the result
' file

Assuming GNU grep, I would pick out the quoted strings and then join them together

grep -oP '".*?"' file | tr -d '\n' | sed 's/" *"//g'; echo

Result from your example (shortened for brevity)

"v=DKIM1; h=sha256; k=rsa; t=y; p=MIGfMA0GCSqG…QAB"

Assuming GNU grep, I would pick out the quoted strings and then join them together

grep -oP '".*?"' file | tr -d '\n' | sed 's/" *"//g'; echo

Result from your example (shortened for brevity)

"v=DKIM1; h=sha256; k=rsa; t=y; p=MIGfMA0GCSqG…QAB"

Alternatively you could use perl,

perl -e '
    $_ = join(" ", (map {chomp; $_} <>));    # Read and join lines
    s/^.*?(".*").*$/$1/;                      # Strip leading and trailing text outside quoted strings
    s/"\s*"/ /g;                              # Merge adjacent quoted strings
    s/\s\s+/ /g;                              # Reduce multiple spaces to one
    print                                     # Output the result
' file

Source Link

answered Feb 8, 2023 at 19:01

Chris Davies

128k
16
178
323

Assuming GNU grep, I would pick out the quoted strings and then join them together

grep -oP '".*?"' file | tr -d '\n' | sed 's/" *"//g'; echo

Result from your example (shortened for brevity)

"v=DKIM1; h=sha256; k=rsa; t=y; p=MIGfMA0GCSqG…QAB"

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