int
fsm_main(const char *s)
{
	const char *p;

	enum {
		S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, 
		S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, 
		S20, S21, S22, S23, S24, S25, S26, S27, S28
	} state;

	state = S0;

	for (p = s; *p != '\0'; p++) {
		switch (state) {
		case S0: /* start */
			switch ((unsigned char) *p) {
			case '0':
			case '1':
			case '2':
			case '3': state = S1; break;
			default:  return -1; /* leaf */
			}
			break;

		case S1: /* e.g. "0" */
			switch ((unsigned char) *p) {
			case '0':
			case '1':
			case '2':
			case '3':
			case '4':
			case '5':
			case '6':
			case '7':
			case '8':
			case '9': state = S2; break;
			default:  return -1; /* leaf */
			}
			break;

		case S2: /* e.g. "00" */
			switch ((unsigned char) *p) {
			case 'J': state = S3; break;
			case 'F': state = S4; break;
			case 'A': state = S5; break;
			case '-': state = S6; break;
			case 'O': state = S7; break;
			case 'S': state = S8; break;
			case 'N': state = S9; break;
			case 'D': state = S10; break;
			case 'M': state = S11; break;
			default:  return -1; /* leaf */
			}
			break;

		case S3: /* e.g. "00J" */
			switch ((unsigned char) *p) {
			case 'u': state = S27; break;
			case 'a': state = S28; break;
			default:  return -1; /* leaf */
			}
			break;

		case S4: /* e.g. "00F" */
			switch ((unsigned char) *p) {
			case 'e': state = S26; break;
			default:  return -1; /* leaf */
			}
			break;

		case S5: /* e.g. "00A" */
			switch ((unsigned char) *p) {
			case 'p': state = S24; break;
			case 'u': state = S25; break;
			default:  return -1; /* leaf */
			}
			break;

		case S6: /* e.g. "00-" */
			switch ((unsigned char) *p) {
			case 'J': state = S3; break;
			case 'F': state = S4; break;
			case 'A': state = S5; break;
			case 'O': state = S7; break;
			case 'S': state = S8; break;
			case 'N': state = S9; break;
			case 'D': state = S10; break;
			case 'M': state = S11; break;
			default:  return -1; /* leaf */
			}
			break;

		case S7: /* e.g. "00O" */
			switch ((unsigned char) *p) {
			case 'c': state = S23; break;
			default:  return -1; /* leaf */
			}
			break;

		case S8: /* e.g. "00S" */
			switch ((unsigned char) *p) {
			case 'e': state = S22; break;
			default:  return -1; /* leaf */
			}
			break;

		case S9: /* e.g. "00N" */
			switch ((unsigned char) *p) {
			case 'o': state = S21; break;
			default:  return -1; /* leaf */
			}
			break;

		case S10: /* e.g. "00D" */
			switch ((unsigned char) *p) {
			case 'e': state = S20; break;
			default:  return -1; /* leaf */
			}
			break;

		case S11: /* e.g. "00M" */
			switch ((unsigned char) *p) {
			case 'a': state = S12; break;
			default:  return -1; /* leaf */
			}
			break;

		case S12: /* e.g. "00Ma" */
			switch ((unsigned char) *p) {
			case 'r':
			case 'y': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		case S13: /* e.g. "00Dec" */
			switch ((unsigned char) *p) {
			case '2': state = S14; break;
			case '1': state = S15; break;
			case '-': state = S16; break;
			default:  return -1; /* leaf */
			}
			break;

		case S14: /* e.g. "00Dec2" */
			switch ((unsigned char) *p) {
			case '0': state = S17; break;
			default:  return -1; /* leaf */
			}
			break;

		case S15: /* e.g. "00Dec1" */
			switch ((unsigned char) *p) {
			case '9': state = S17; break;
			default:  return -1; /* leaf */
			}
			break;

		case S16: /* e.g. "00Dec-" */
			switch ((unsigned char) *p) {
			case '2': state = S14; break;
			case '1': state = S15; break;
			default:  return -1; /* leaf */
			}
			break;

		case S17: /* e.g. "00Dec20" */
			switch ((unsigned char) *p) {
			case '0':
			case '1':
			case '2':
			case '3':
			case '4':
			case '5':
			case '6':
			case '7':
			case '8':
			case '9': state = S18; break;
			default:  return -1; /* leaf */
			}
			break;

		case S18: /* e.g. "00Dec200" */
			switch ((unsigned char) *p) {
			case '0':
			case '1':
			case '2':
			case '3':
			case '4':
			case '5':
			case '6':
			case '7':
			case '8':
			case '9': state = S19; break;
			default:  return -1; /* leaf */
			}
			break;

		case S19: /* e.g. "00Dec2000" */
			return -1; /* leaf */

		case S20: /* e.g. "00De" */
			switch ((unsigned char) *p) {
			case 'c': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		case S21: /* e.g. "00No" */
			switch ((unsigned char) *p) {
			case 'v': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		case S22: /* e.g. "00Se" */
			switch ((unsigned char) *p) {
			case 'p': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		case S23: /* e.g. "00Oc" */
			switch ((unsigned char) *p) {
			case 't': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		case S24: /* e.g. "00Ap" */
			switch ((unsigned char) *p) {
			case 'r': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		case S25: /* e.g. "00Au" */
			switch ((unsigned char) *p) {
			case 'g': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		case S26: /* e.g. "00Fe" */
			switch ((unsigned char) *p) {
			case 'b': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		case S27: /* e.g. "00Ju" */
			switch ((unsigned char) *p) {
			case 'l':
			case 'n': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		case S28: /* e.g. "00Ja" */
			switch ((unsigned char) *p) {
			case 'n': state = S13; break;
			default:  return -1; /* leaf */
			}
			break;

		default:
			; /* unreached */
		}
	}

	/* end states */
	switch (state) {
	case S19: return 0x1; /* "[0123][0-9]-?(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)-?(19|20)[0-9]{2}" */
	default: return -1; /* unexpected EOT */
	}
}