Rexpy

The rexpy command

rexpy [FLAGS] [inputfile [outputfile]]

If inputfile is provided, it should contain one string per line; otherwise lines will be read from standard input.

If outputfile is provided, regular expressions found will be written to that (one per line); otherwise they will be written to standard output.

Optional FLAGS may be used to modify Rexpy's behaviour:

  • -h, --header
    Discard first line, as a header.

  • -?, --help
    Print this usage information and exit (without error).

  • -g, --group
    Generate capture groups for each variable fragment of each regular expression generated, i.e. surround variable components with parentheses, e.g.

    `^[A-Z]+\-[0-9]+$`

    becomes

    `^([A-Z]+)\-([0-9]+)$`

  • -q, --quote
    Display the resulting regular expressions as double-quoted, escaped strings, in a form broadly suitable for use in Unix shells, JSON, and string literals in many programming languages. e.g.

    `^[A-Z]+\-[0-9]+$`

    becomes

    `"^[A-Z]+\\-[0-9]+$"`

  • --portable
    Produce maximally portable regular expressions (e.g. [0-9] rather than \d). (This is the default.)

  • --grep
    Same as --portable

  • --java
    Produce Java-style regular expressions (e.g. \p{Digit})

  • --posix
    Produce POSIX-compliant regular expressions (e.g. [[:digit:]] rather than \d).

  • --perl
    Produce Perl-style regular expressions (e.g. \d)

  • -u, --underscore, -_
    Allow underscore to be treated as a letter. Mostly useful for matching identifiers.

  • -d, --dot, -., --period
    Allow dot to be treated as a letter. Mostly useful for matching identifiers.

  • -m, --minus, --hyphen, --dash
    Allow minus to be treated as a letter. Mostly useful for matching identifiers.

  • -v, --version
    Print the version number.

  • -V, --verbose
    Set verbosity level to 1

  • -VV, --Verbose
    Set verbosity level to 2

  • -vlf, --variable
    Use variable length fragments

  • -flf, --fixed
    Use fixed length fragments

Rexpy Examples

TDDA rexpy is supplied with a set of examples.

To copy the rexpy examples, run the command:

tdda examples rexpy

This will create or overwrite a directory rexpy_examples in the current directory.

Alternatively, you can copy all examples using the following command:

tdda examples

which will create a number of separate subdirectories.