What is the correct syntax for rsyslog's re_match()?

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I'm trying to filter unwanted messages from a cron job (systemd) from rsyslog output. However rsyslog always complains about the second argument of re_match(). The filter rule I have is:



if $programname == "systemd" and re_match($msg, '^Started [Ss]ession d+ of user ntpmon.$') then stop


I started putting the regex in double-quotes, and rsyslog complained. Then I put the regex in single quotes, and rsyslog still complains.



The documentation is a bit vague:



re_match(expr, re)

 returns 1, if expr matches re, 0 otherwise. Uses POSIX ERE.


How do I fix it (the filter, not the docs)?






regular-expression rsyslog filter







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    I'm trying to filter unwanted messages from a cron job (systemd) from rsyslog output. However rsyslog always complains about the second argument of re_match(). The filter rule I have is:



    if $programname == "systemd" and re_match($msg, '^Started [Ss]ession d+ of user ntpmon.$') then stop


    I started putting the regex in double-quotes, and rsyslog complained. Then I put the regex in single quotes, and rsyslog still complains.



    The documentation is a bit vague:



    re_match(expr, re)

     returns 1, if expr matches re, 0 otherwise. Uses POSIX ERE.


    How do I fix it (the filter, not the docs)?






    regular-expression rsyslog filter







    share|improve this question







    New contributor




    U. Windl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
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      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I'm trying to filter unwanted messages from a cron job (systemd) from rsyslog output. However rsyslog always complains about the second argument of re_match(). The filter rule I have is:



      if $programname == "systemd" and re_match($msg, '^Started [Ss]ession d+ of user ntpmon.$') then stop


      I started putting the regex in double-quotes, and rsyslog complained. Then I put the regex in single quotes, and rsyslog still complains.



      The documentation is a bit vague:



      re_match(expr, re)

       returns 1, if expr matches re, 0 otherwise. Uses POSIX ERE.


      How do I fix it (the filter, not the docs)?






      regular-expression rsyslog filter







      share|improve this question







      New contributor




      U. Windl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I'm trying to filter unwanted messages from a cron job (systemd) from rsyslog output. However rsyslog always complains about the second argument of re_match(). The filter rule I have is:



      if $programname == "systemd" and re_match($msg, '^Started [Ss]ession d+ of user ntpmon.$') then stop


      I started putting the regex in double-quotes, and rsyslog complained. Then I put the regex in single quotes, and rsyslog still complains.



      The documentation is a bit vague:



      re_match(expr, re)

       returns 1, if expr matches re, 0 otherwise. Uses POSIX ERE.


      How do I fix it (the filter, not the docs)?






      regular-expression rsyslog filter




      regular-expression rsyslog filter






      share|improve this question







      New contributor




      U. Windl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      U. Windl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






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      U. Windl

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      New contributor





      U. Windl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






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          You need to double the backslash, otherwise rsyslog tries to interpret d as an escape sequence within a string, and this is not parseable. So it should be \d.



          But d is not a Posix ERE. You presumably meant [0-9], for example, for a digit. So try



          '^Started [Ss]ession [0-9]+ of user ntpmon\.$'





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            You need to double the backslash, otherwise rsyslog tries to interpret d as an escape sequence within a string, and this is not parseable. So it should be \d.



            But d is not a Posix ERE. You presumably meant [0-9], for example, for a digit. So try



            '^Started [Ss]ession [0-9]+ of user ntpmon\.$'





            share|improve this answer
























              up vote
              0
              down vote













              You need to double the backslash, otherwise rsyslog tries to interpret d as an escape sequence within a string, and this is not parseable. So it should be \d.



              But d is not a Posix ERE. You presumably meant [0-9], for example, for a digit. So try



              '^Started [Ss]ession [0-9]+ of user ntpmon\.$'





              share|improve this answer






















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                up vote
                0
                down vote









                You need to double the backslash, otherwise rsyslog tries to interpret d as an escape sequence within a string, and this is not parseable. So it should be \d.



                But d is not a Posix ERE. You presumably meant [0-9], for example, for a digit. So try



                '^Started [Ss]ession [0-9]+ of user ntpmon\.$'





                share|improve this answer












                You need to double the backslash, otherwise rsyslog tries to interpret d as an escape sequence within a string, and this is not parseable. So it should be \d.



                But d is not a Posix ERE. You presumably meant [0-9], for example, for a digit. So try



                '^Started [Ss]ession [0-9]+ of user ntpmon\.$'






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 11 hours ago









                meuh

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