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Message-ID: <5d2909c4.1c69fb81.acce9.cde9@mx.google.com>
Date: Fri, 12 Jul 2019 15:29:24 -0700 (PDT)
From: Steven Penny <svnpenn AT gmail DOT com>
To: cygwin AT cygwin DOT com
References: <CAGtwZuYLXDHFiAHGVYw8s+jqt0bNtGMpy+6fOSiqjZddazXZew AT mail DOT gmail DOT com>
Subject: Re: Possible issue with gawk 5.0.1-1: Getting new warnings
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On Thu, 11 Jul 2019 11:51:09, Vipul P wrote:
> Here is a sample script to invoke awk:
> 
> $ cat ./gawk_error.sh
> #!/bin/sh
> echo "This:is:a:colon:separated:line:%%%:" | awk '{
>   gsub("\\%", "%25", $0);
>   gsub("\\:", "%3A", $0);
>   print
>   }'

As others said, your invocation is not idiomatic AWK. Anywhere that regular
expressions are expected, like the first argument to "gsub", regular expressions
should be used. If you use a string, you need an extra level of escaping, as
the AWK lexer will parse the string twice:

> If the right-hand operand is any expression other than the lexical token
> **ERE**, the string value of the expression shall be interpreted as an
> extended regular expression, including the escape conventions described
> above. Note that these same escape conventions shall also be applied in
> determining the value of a string literal (the lexical token **STRING**),
> and thus shall be applied a second time when a string literal is used in
> this context.

http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html#tag_20_06_13_04


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