#expr

Version 0.2.0 behavior is documented here. The support record separates local verification from published MoonX behavior; moonx examples use registry releases.

Evaluate integer and string expressions. Pass each operator and operand as a separate argument; quote operators that the calling shell would interpret.

moonx cli/expr 2 + 3
moonx cli/expr length example
moonx cli/expr filename.txt : '.*\.\(.*\)'

Supports |, &, comparisons (=, ==, !=, <, <=, >, >=), integer +, -, *, /, %, anchored BRE matching with :, and parentheses. Integer arithmetic is not limited to machine-word size. Logical operators short-circuit evaluation; skipped expressions still require valid syntax.

length, index, substr, and match provide string operations. Prefix + quotes the next argument as a string, including keywords and operators. Matching returns the first captured group when present, otherwise the matched byte count. Strings use byte offsets and C-locale ordering. The shared BRE matcher supports pattern backreferences, byte classes and word assertions. Repeated nullable captures follow the tested GNU candidate and capture-register selection, including counted repeats and references. See the workspace support record. Locale-aware character operations are not included. --help, --version, and the leading -- separator are available.

Exit status is 0 for a nonempty, nonzero result, 1 for an empty or zero result, and 2 for invalid expressions or evaluation errors.

#Standalone metadata

Standalone --version prints exactly expr 0.2.0 followed by one newline. Standalone --help starts with Usage: expr, lists both metadata options, and ends with a newline. Both write to stdout, leave stdin unread, and exit with status 0. Exact-version publication and verification remain recorded separately in the support record.

Parser

source

type Parser

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expr

#expr

#Standalone metadata

#Parser

Source Files

Parser