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Document new PCRE2 string escaping in CHANGELOG and string.txt

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Mahmoud Al-Qudsi 2018-11-15 11:59:13 -06:00
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CHANGELOG.md
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@ -67,6 +67,7 @@ A new feature flags mechanism is added for staging deprecations and breaking cha
- `string split` supports a new `--no-empty` option to exclude empty strings from the result (#4779).
- `string` has new subcommands `split0` and `join0` for working with NUL-delimited output.
- `string` no longer stops processing text after NUL characters (#4605)
- `string escape` has a new `--style pcre2` option for escaping strings to be matched literally in `string` regex operations.
- `test` now supports floating point values in numeric comparisons.
### Interactive improvements

8
doc_src/string.txt
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@ -42,11 +42,13 @@ The following subcommands are available.
`string escape` escapes each STRING in one of three ways. The first is `--style=script`. This is the default. It alters the string such that it can be passed back to `eval` to produce the original argument again. By default, all special characters are escaped, and quotes are used to simplify the output when possible. If `-n` or `--no-quoted` is given, the simplifying quoted format is not used. Exit status: 0 if at least one string was escaped, or 1 otherwise.
The second is `--style=var` which ensures the string can be used as a variable name by hex encoding any non-alphanumeric characters. The string is first converted to UTF-8 before being encoded.
`--style=var` ensures the string can be used as a variable name by hex encoding any non-alphanumeric characters. The string is first converted to UTF-8 before being encoded.
The third is `--style=url` which ensures the string can be used as a URL by hex encoding any character which is not legal in a URL. The string is first converted to UTF-8 before being encoded.
`--style=url` ensures the string can be used as a URL by hex encoding any character which is not legal in a URL. The string is first converted to UTF-8 before being encoded.
`string unescape` performs the inverse of the `string escape` command. If the string to be unescaped is not properly formatted it is ignored. For example, doing `string unescape --style=var (string escape --style=var $str)` will return the original string.
`--style=pcre2` escapes an input string for literal matching within a regex expression. The string is first converted to UTF-8 before being encoded.
`string unescape` performs the inverse of the `string escape` command. If the string to be unescaped is not properly formatted it is ignored. For example, doing `string unescape --style=var (string escape --style=var $str)` will return the original string. There is no support for unescaping pcre2.
\subsection string-join "join" subcommand