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/* Generated by re2c */ // re2c $INPUT -o $OUTPUT -i --case-ranges #include <assert.h> bool lex(const char *s) { const char *YYCURSOR = s; { char yych; yych = *YYCURSOR; switch (yych) { case '1' ... '9': goto yy2; default: goto yy1; } yy1: ++YYCURSOR; { return false; } yy2: yych = *++YYCURSOR; switch (yych) { case '0' ... '9': goto yy2; default: goto yy3; } yy3: { return true; } } } int main() { assert(lex("1234")); return 0; }