More strict regex

[EdwinKM]

The plugin breaks when entering text with multiple plusses. For example, the openssl tool will create lines like:
...................................................................................+++++

We can
fold.txt
improve the regex:

• Should only start with a "+"
• Should be exactly be 4 plusses.
• Newline required after the 4 plusses.

Was toying with something like:
'^+{4}[^+].|(?=.++++$)

But it breaks also. Not sure to part after the pipe (not sure what a "line" is for dokuwiki).
Example file included.

Note: Strict settings can potentially break if users did not exactly followed the syntax.

[atisne]

The pattern ++ is definitively too common. So many tools use a name containing ++ : C++, Notepad++, bonnie++, tolua++, g++, vera++.
What about using the pattern <++></++> ?
I'm aware that changing the syntax pattern have a big impact on the existing. May the pattern be configurable? At least the number of '+'?

[fiwswe]

a) We are dealing with two patterns: inline ++ and block ++++.
b) The patterns also need to take into account the title.
c) Breaking existing pages by changing the patterns is not a good idea. (But you could certainly write a different plugin with similar functionality which uses a different pattern. Or indeed submit a PR to allow configuration of the pattern.)
d) Something++ is only somewhat common in the IT world. And for us nerds it should not be too difficult to simply write %%Something++%% instead. I maintain several (private) wikis with IT content and I have never even noticed this problem.

[ShareBugreports]

This breaks the plugin also.

++++ block |

sftp://192.168.1.1
++++

[fiwswe]

@ShareBugreports This seems like a separate issue to me. I think this may be caused by the DokuWiki automatic URL detection, as the following works fine:

++++ block |

[[sftp://192.168.1.1]]
++++

But I don't have time to analyse this right now.