File: 01_basic.re

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// re2js $INPUT -o $OUTPUT

function lex(yyinput) {
    let yycursor = 0;
    /*!re2c
        re2c:yyfill:enable = 0;

        [1-9][0-9]* { return true; }
        *           { return false; }
    */
}

if (!lex("1234\0")) {
    throw "error!"
}