How to use sed grep to extract text between two words

Question

I am trying to output a string that contains everything between two words of a string   input    Here is a String    output    is a    Using    sed -n   Here   String p    includes the endpoints  but I don t want to include them

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If you have a long file with many multi-line ocurrences  it is useful to first print  number lines   cat -n file   sed -n   Here   String p

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Through GNU awk     echo  Here is a string    awk -v FS   Here string     print  2    is a    grep with -P perl-regexp  parameter supports  K  which helps in discarding the previously matched characters  In our case   the previously matched string was Here so it got discarded from the final output     echo  Here is a string    grep -oP  Here K     string    is a    echo  Here is a string    grep -oP  Here K      string       is a    If you want the output to be is a then you could try the below     echo  Here is a string    grep -oP  Here s  K      s string   is a   echo  Here is a string    grep -oP  Here s  K       s string      is a

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To understand sed command  we have to build it step by step  Here is your original text user linux    echo  quot Here is a String quot  Here is a String user linux      Let s try to remove Here string with substition option in sed user linux    echo  quot Here is a String quot    sed  s Here     is a String user linux      At this point  I believe you would be able to remove String as well user linux    echo  quot Here is a String quot    sed  s String    Here is a user linux      But this is not your desired output  To combine two sed commands  use -e option user linux    echo  quot Here is a String quot    sed -e  s Here     -e  s String    is a user linux      Hope this helps

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You can use two s commands    echo  Here is a String    sed  s   Here    s String       is a    Also works    echo  Here is a StringHere is a String    sed  s   Here    s String       is a    echo  Here is a StringHere is a StringHere is a StringHere is a String    sed  s   Here    s String       is a

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All the above solutions have deficiencies where the last search string is repeated elsewhere in the string   I found it best to write a bash function       function str str         local str       str    1    2          str    str   3          echo -n   str               test it         mystr  this is a string      str str   mystr   this     string

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Problem   My stored Claws Mail messages are wrapped as follows  and I am trying to extract the Subject lines   Subject   SLC38A9 lysosomal arginine sensor  mTORC1 pathway  Key molecular  link in major cell growth pathway  Findings point to new potential  therapeutic target in pancreatic cancer  mTORC1 Activator SLC38A9 Is  Required to Efflux Essential Amino Acids from Lysosomes and Use Protein as  a Nutrient   Re  Nutrient sensor in key growth-regulating metabolic pathway  identified  Lysosomal amino acid transporter SLC38A9 signals arginine  sufficiency to mTORC1   Message-ID   lt 20171019190902 18741771 VictoriasJourney com gt    Per A2 in this thread  How to use sed grep to extract text between two words  the first expression  below   works  as long as the matched text does not contain a newline   grep -o -P     lt  Subject        molecular   corpus 01   SLC38A9 lysosomal arginine sensor  mTORC1 pathway  Key   However  despite trying numerous variants        s        I could not get these to work   grep -o -P     lt  Subject        link   corpus 01 grep -o -P     lt  Subject        therapeutic   corpus 01 etc    Solution 1   Per Extract text between two strings on different lines  sed -n   Subject     a N  Message-ID   ba  s  n   g  s  s s    g  s   Subject    Message-ID     g p   corpus 01   which gives   SLC38A9 lysosomal arginine sensor  mTORC1 pathway  Key molecular link in major cell growth pathway  Findings point to new potential therapeutic target in pancreatic cancer  mTORC1 Activator SLC38A9 Is Required to Efflux Essential Amino Acids from Lysosomes and Use Protein as a Nutrient   Re  Nutrient sensor in key growth-regulating metabolic pathway identified  Lysosomal amino acid transporter SLC38A9 signals arginine sufficiency to mTORC1                                   Solution 2    Per How can I replace a newline   n  using sed   sed   a N   ba s  n   g  corpus 01   will replace newlines with a space   Chaining that with A2 in How to use sed grep to extract text between two words   we get   sed   a N   ba s  n   g  corpus 01   grep -o -P     lt  Subject        Message-ID      which gives   SLC38A9 lysosomal arginine sensor  mTORC1 pathway  Key molecular  link in major cell growth pathway  Findings point to new potential  therapeutic target in pancreatic cancer  mTORC1 Activator SLC38A9 Is  Required to Efflux Essential Amino Acids from Lysosomes and Use Protein as  a Nutrient   Re  Nutrient sensor in key growth-regulating metabolic pathway  identified  Lysosomal amino acid transporter SLC38A9 signals arginine  sufficiency to mTORC1      This variant removes double spaces   sed   a N   ba s  n   g  s  s s    g  corpus 01   grep -o -P     lt  Subject        Message-ID      giving   SLC38A9 lysosomal arginine sensor  mTORC1 pathway  Key molecular link in major cell growth pathway  Findings point to new potential therapeutic target in pancreatic cancer  mTORC1 Activator SLC38A9 Is Required to Efflux Essential Amino Acids from Lysosomes and Use Protein as a Nutrient   Re  Nutrient sensor in key growth-regulating metabolic pathway identified  Lysosomal amino acid transporter SLC38A9 signals arginine sufficiency to mTORC1

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sed -e  s Here      String  1

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You can use  1  refer to http   www grymoire com Unix Sed html uh-4    echo  Hello is a String    sed  s Hello      String  1 g    The contents that is inside the brackets will be stored as  1

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The accepted answer does not remove text that could be before Here or after String  This will   sed -e  s   Here      String    1     The main difference is the addition of    immediately before Here and after String

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You can strip strings in Bash alone     foo  Here is a String    foo   foo   Here     echo   foo  is a String   foo   foo   String     echo   foo  is a     And if you have a GNU grep that includes PCRE  you can use a zero-width assertion     echo  Here is a String    grep -Po     lt   Here         String   is a

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This might work for you  GNU sed    sed   Here  d s   amp  n  s    n    a  String bb    n ba   b s   n amp   P D  file    This presents each representation of text between two markers  in this instance Here and String  on a newline and preserves newlines within the text

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GNU grep can also support positive  amp  negative look-ahead  amp  look-back  For your case  the command would be   echo  Here is a string    grep -o -P     lt  Here      string     If there are multiple occurrences of Here and string  you can choose whether you want to match from the first Here and last string or match them individually  In terms of regex  it is called as greedy match  first case  or non-greedy match  second case     echo  Here is a string  and Here is another string     grep -oP     lt  Here      string     Greedy match  is a string  and Here is another    echo  Here is a string  and Here is another string     grep -oP     lt  Here       string     Non-greedy match  Notice the     after     in      is a   is another

[string] How to use sed/grep to extract text between two words?

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