Add comment about binary zeros.
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.TH PCRE2GREP 1 "01 April 2016" "PCRE2 10.22"
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.TH PCRE2GREP 1 "06 April 2016" "PCRE2 10.22"
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.SH NAME
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pcre2grep - a grep with Perl-compatible regular expressions.
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.SH SYNOPSIS
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@ -675,7 +675,7 @@ following substrings specifying arguments:
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.sp
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executable_name|arg1|arg2|...
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.sp
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Any substirng (including the executable name) may contain escape sequences
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Any substring (including the executable name) may contain escape sequences
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started by a dollar character: $<digits> or ${<digits>} is replaced by the
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captured substring of the given decimal number, which must be greater than
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zero. If the number is greater than the number of capturing substrings, or if
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@ -695,10 +695,14 @@ a single dollar and $| is replaced by a pipe character. Here is an example:
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Arg1: [1] [234] [4] Arg2: |1| ()
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12345
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.sp
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Any syntax errors in the string (for example, a dollar not followed by another
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character) cause the callout to be ignored. If running the program fails for
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any reason (including the non-existence of the executable), a local matching
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failure occurs and the matcher backtracks in the normal way.
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The parameters for the \fBexecv()\fP system call that is used to run the
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program or script are zero-terminated strings. This means that binary zero
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characters in the callout argument will cause premature termination of their
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substrings, and therefore should not be present. Any syntax errors in the
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string (for example, a dollar not followed by another character) cause the
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callout to be ignored. If running the program fails for any reason (including
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the non-existence of the executable), a local matching failure occurs and the
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matcher backtracks in the normal way.
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.
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.
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.SH "MATCHING ERRORS"
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@ -748,6 +752,6 @@ Cambridge, England.
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.rs
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.sp
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.nf
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Last updated: 01 April 2016
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Last updated: 06 April 2016
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Copyright (c) 1997-2016 University of Cambridge.
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.fi
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