Match two strings in one line with grep

Question

I am trying to use grep to match lines that contain two different strings  I have tried the following but this matches lines that contain either string1 or string2 which not what I want   grep  string1  string2  filename   So how do I match with grep only the lines that contain both strings

User · Answer

ripgrep  Here is the example using rg   rg -N    P lt p1 gt   string1     P lt p2 gt   string2     file txt   It s one of the quickest grepping tools  since it s built on top of Rust s regex engine which uses finite automata  SIMD and aggressive literal optimizations to make searching very fast   Use it  especially when you re working with a large data   See also related feature request at GH-875

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You could try something like this    pattern1  pattern2 pattern2  pattern1

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You should have grep like this     grep  string1  file   grep  string2

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grep    string1  string2    FILENAME    GNU grep version 3 1

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Place the strings you want to grep for into a file  echo who     gt  find txt echo Roger  gt  gt  find txt echo  44  0-9  9    gt  gt  find txt   Then search using -f   grep -f find txt BIG FILE TO SEARCH txt

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To search for files containing all the words in any order anywhere   grep -ril   action     xargs grep -il   model     xargs grep -il   view type     The first grep kicks off a recursive search  r   ignoring case  i  and listing  printing out  the name of the files that are matching  l  for one term   action  with the single quotes  occurring anywhere in the file   The subsequent greps search for the other terms  retaining case insensitivity and listing out the matching files   The final list of files that you will get will the ones that contain these terms  in any order anywhere in the file

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You can use grep  string1  filename   grep  string2   Or grep  string1  string2  string2  string1  filename

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The   operator in a regular expression means or  That is to say either string1 or string2 will match  You could do   grep  string1  filename   grep  string2    which will pipe the results from the first command into the second grep  That should give you only lines that match both

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Don t try to use grep for this  use awk instead  To match 2 regexps R1 and R2 in grep you d think it would be   grep  R1  R2 R2  R1    while in awk it d be   awk   R1   amp  amp   R2     but what if R2 overlaps with or is a subset of R1  That grep command simply would not work while the awk command would  Lets say you want to find lines that contain the and heat     echo  theatre    grep  the  heat heat  the    echo  theatre    awk   the   amp  amp   heat   theatre   You d have to use 2 greps and a pipe for that     echo  theatre    grep  the    grep  heat  theatre   and of course if you had actually required them to be separate you can always write in awk the same regexp as you used in grep and there are alternative awk solutions that don t involve repeating the regexps in every possible sequence   Putting that aside  what if you wanted to extend your solution to match 3 regexps R1  R2  and R3  In grep that d be one of these poor choices   grep  R1  R2  R3 R1  R3  R2 R2  R1  R3 R2  R3  R1 R3  R1  R2 R3  R2  R1  file grep R1 file   grep R2   grep R3   while in awk it d be the concise  obvious  simple  efficient   awk   R1   amp  amp   R2   amp  amp   R3     Now  what if you actually wanted to match literal strings S1 and S2 instead of regexps R1 and R2  You simply can t do that in one call to grep  you have to either write code to escape all RE metachars before calling grep   S1   sed  s        amp   g  s        g   lt  lt  lt   R1   S2   sed  s        amp   g  s        g   lt  lt  lt   R2   grep  S1  S2 S2  S1    or again use 2 greps and a pipe   grep -F  S1  file   grep -F  S2    which again are poor choices whereas with awk you simply use a string operator instead of regexp operator   awk  index  0 S1   amp  amp  index  0 S2     Now  what if you wanted to match 2 regexps in a paragraph rather than a line  Can t be done in grep  trivial in awk   awk -v RS      R1   amp  amp   R2     How about across a whole file  Again can t be done in grep and trivial in awk  this time I m using GNU awk for multi-char RS for conciseness but it s not much more code in any awk or you can pick a control-char you know won t be in the input for the RS to do the same    awk -v RS        R1   amp  amp   R2     So - if you want to find multiple regexps or strings in a line or paragraph or file then don t use grep  use awk

User · Answer

And as people suggested perl and python  and convoluted shell scripts  here a simple awk approach   awk   string1   amp  amp   string2   filename   Having looked at the comments to the accepted answer  no  this doesn t do multi-line  but then that s also not what the author of the question asked for

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for multiline match   echo -e  test1 ntest2 ntest3   tr -d   n   grep  test1  test3    or  echo -e  test1 ntest5 ntest3   gt tst txt cat tst txt  tr -d   n   grep  test1  test3  test3  test1    we just need to remove the newline character and it works

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When the both strings are in sequence then put a pattern in between on grep command     grep -E  string1     string2  file   Example if the following lines are contained in a file named Dockerfile   FROM python 3 8 as build-python FROM python 3 8-slim   To get the line that contains the strings  FROM python and as build-python then use     grep -E  FROM python       as build-python  Dockerfile   Then the output will show only the line that contain both strings   FROM python 3 8 as build-python

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Let s say we need to find count of multiple words in a file testfile  There are two ways to go about it  1  Use grep command with regex matching pattern   grep -c    lt   DOG  CAT    gt   testfile   2  Use egrep command   egrep -c  DOG CAT  testfile    With egrep you need not to worry about expression and just separate words by a pipe separator

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grep   string1  string2   string2  string1   filename   will get line with string1 and string2 in any order

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I think this is what you were looking for   grep -E  string1 string2  filename   I think that answers like this   grep  string1  string2  string2  string1  filename   only match the case where both are present  not one or the other or both

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grep -i -w  string1  string2  filename   This works for exact word match and matching case insensitive words  for that -i is used

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Found lines that only starts with 6 spaces and finished with    cat my file txt   grep  -e              c    cpp    h    log    out       c or  cpp or  h or  log or  out  -e            0-9   5 9       numers between 5 and 9 digist   gt  nolog txt

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git grep Here is the syntax using git grep with multiple patterns  git grep --all-match --no-index -l -e string1 -e string2 -e string3 file  You may also combine patterns with Boolean expressions such as --and  --or and --not  Check man git-grep for help    --all-match When giving multiple pattern expressions  this flag is specified to limit the match to files that have lines to match all of them  --no-index Search files in the current directory that is not managed by Git  -l --files-with-matches --name-only Show only the names of files  -e The next parameter is the pattern  Default is to use basic regexp   Other params to consider   --threads Number of grep worker threads to use  -q --quiet --silent Do not output matched lines  exit with status 0 when there is a match   To change the pattern type  you may also use -G --basic-regexp  default   -F --fixed-strings  -E --extended-regexp  -P --perl-regexp  -f file  and other  Related   How to grep for two words existing on the same line  Check if all of multiple strings or regexes exist in a file How to run grep with multiple AND patterns   amp  Match all patterns from file at once  For OR operation  see   How do I grep for multiple patterns with pattern having a pipe character  Grep  how to add an    OR    condition

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Your method was almost good  only missing the -w  grep -w  string1  string2  filename

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I often run into the same problem as yours  and I just wrote a piece of script   function m       m means  multi pattern grep       function  usage         echo  usage  COMMAND  -inH  -p lt pattern1 gt  -p lt pattern2 gt   lt filename gt       echo  -i   ignore case      echo  -n   show line number      echo  -H   show filename      echo  -h   show header      echo  -p   specify pattern             declare -a patterns       it is important to declare OPTIND as local     local ignorecase flag  filename linum header flag colon result OPTIND      while getopts  iHhnp   opt  do     case  opt in         i          ignorecase flag true            H          filename  FILENAME              n          linum  NR              p          patterns      OPTARG               h          header flag true                         usage         return        esac     done      if    -n  filename    -n  linum     then     colon              fi      shift      OPTIND - 1         if     ignorecase flag    true     then     for s in    patterns       do             result     amp  amp  s    s          done     result   result   amp  amp        result   s tolower   0    result      else     for s in    patterns       do             result   result  amp  amp    s       done     result   result   amp  amp        fi      result      print   filename linum colon   0         if      -t 0     then         pipe case     cat -   awk    result       else     for f in       do             header flag    true     amp  amp  echo              f                     awk    result    f     done     fi     Usage   echo  a b c    m -p A  echo  a b c    m -i -p A   a b c   You can put it in  bashrc if you like

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If you have a grep with a -P option for a limited perl regex  you can use  grep -P       string1      string2     which has the advantage of working with overlapping strings   It s somewhat more straightforward using perl as grep  because you can specify the and logic more directly   perl -ne  print if  string1   amp  amp   string2

[regex] Match two strings in one line with grep

`ripgrep`

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