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+# Frequently Asked Questions
+
+### How to check for empty lines in the middle of the expected output?
+
+``byexample`` uses an empty line to separate one example from the other.
+If the output of your example contains such line, you need to *trick*
+to ``byexample``.
+
+Pick an unused character and use it as a glue in replace of the empty lines,
+instruct to ``byexample`` to
+[remove it]()
+before performing the comparison and *voila*.
+
+```python
+>>> print("Line1\n\nLine3")         # byexample: +rm=~
+Line1
+~
+Line3
+```
+
+### How to ignore the capture tag ``<xxx>``?
+
+If the output of your example has the literal ``<xxx>`` and you want
+to take it *literally*, you could disable the
+[capture tags](basic/capture-and-paste)
+
+```python
+>>> print("<0>, <1>, and <tag>")        # byexample: -tags
+<0>, <1>, and <tag>
+```
+
+If you do not want to disable the capture tags functionality but
+you just want to some of them to be taken literally, you need
+to introduce an unused character and remove it before the comparison
+
+```python
+>>> print("<0>, <1>, and junk")        # byexample: +rm=~
+<~0>, <~1>, and <tag>
+```
+
+### How to escape a prompt inside of another example?
+
+``byexample`` uses the prompts to detect examples and in which langueges
+are written.
+
+It uses different heuristics to avoid false positives but it is possible
+that the *output* of an example could be *confused* with another example
+because it contains a prompt.
+
+To avoid this, prefix an unused character and remove it before the comparison:
+
+```shell
+>>> print("$ this is not a 'shell' example, just the output of a python example") # byexample: +rm=~
+~$ this is not a 'shell' example, just the output of a python example
+```
+
+In the example above ``$`` would be confused with the prompt of ``shell``.
+
+Prefixing ``~`` avoids this and the +rm=~ removes it before the comparison.
+
+### Why my ``<foo_bar>`` tag is not recognized?
+
+Only alphabetic, numeric characters plus the minus are recognized.
+An *underscore* is not.
+
+```
+bad:  <foo_bar>
+good: <foo-bar>
+```
+
+Do't worry, I made this mistake a few times too.
+
+### Check for the last line of xxx fails, why?
+
+May be you wrote something like this?
+
+```python
+>>> print("last line\n")
+last line
+<...>
+```
+
+That example will work only if the line ends in a new line.
+
+To ignore that you need to use ``<...>`` in the same line:
+
+```python
+>>> print("last line")
+last line<...>
+```