private boolean verifyConversionPair(String lengthModifier, String conversionSpecifier) {
		if (lengthModifier == null || lengthModifier.equals("l")) {
			return true;
		}
		if ((lengthModifier.equals("L") && isDouble(conversionSpecifier)) ||
			(!lengthModifier.equals("L") &&
				(isInteger(conversionSpecifier) || isIntegerPointer(conversionSpecifier)))) {
			return true;
		}
		return false;
	}
Skips a series of numbers (field width or precision) within a format String.
returns the index of the format String at the last digit before another
non-digit character

@param formatString format String
@param i      index into formatStr
@return new index into formatString
Ghidra/Features/DecompilerDependent/src/main/java/ghidra/app/plugin/core/string/variadic/FormatStringParser.java