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31 lines
1.6 KiB
ReStructuredText
31 lines
1.6 KiB
ReStructuredText
..
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PLEASE DO NOT EDIT DIRECTLY. EDIT THE .rst.in FILE PLEASE.
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Main reference
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================================================================
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TODO: keep splititng up this big file
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String literals
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----------------------------------------------------------------
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You can use the following backslash escapes for strings such as between the double quotes in contexts such as ``mlr filter '$name =~ "..."'``, ``mlr put '$name = $othername . "..."'``, ``mlr put '$name = sub($name, "...", "...")``, etc.:
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* ``\a``: ASCII code 0x07 (alarm/bell)
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* ``\b``: ASCII code 0x08 (backspace)
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* ``\f``: ASCII code 0x0c (formfeed)
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* ``\n``: ASCII code 0x0a (LF/linefeed/newline)
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* ``\r``: ASCII code 0x0d (CR/carriage return)
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* ``\t``: ASCII code 0x09 (tab)
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* ``\v``: ASCII code 0x0b (vertical tab)
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* ``\\``: backslash
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* ``\"``: double quote
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* ``\123``: Octal 123, etc. for ``\000`` up to ``\377``
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* ``\x7f``: Hexadecimal 7f, etc. for ``\x00`` up to ``\xff``
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See also https://en.wikipedia.org/wiki/Escape_sequences_in_C.
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These replacements apply only to strings you key in for the DSL expressions for ``filter`` and ``put``: that is, if you type ``\t`` in a string literal for a ``filter``/``put`` expression, it will be turned into a tab character. If you want a backslash followed by a ``t``, then please type ``\\t``.
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However, these replacements are not done automatically within your data stream. If you wish to make these replacements, you can do, for example, for a field named ``field``, ``mlr put '$field = gsub($field, "\\t", "\t")'``. If you need to make such a replacement for all fields in your data, you should probably simply use the system ``sed`` command.
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