Perl language syntax highlighting troubles (bug or limitation ?)

Gilles Maisonneuve

I think I found why.
Your regexp says :
r'(?s)((<<)"*(\w+?)"*;.*?\3)'
would not it be better if :
r'(?s)(\h*(<<)\h*"*(\w+?)"*\h*;.*?\3)'

???

To answer your question:

Perl allows

<<TEXT,
<< TEXT
<<‘TEXT’ / << ‘TEXT’
<<“TEXT” / << “TEXT”

meanings differ in each case…

Ekopalypse

To be honest - I’m not a regex expert at all :-D
If you, as a perl developer, say so I would absolutely believe it is :-)

Gilles Maisonneuve

@Ekopalypse

In your Python regexp, what’s the meaning of:

“\3”
“, [2]” and “[2,3]” ?

If I can understand what I think I could translate a Perl regex code into python (for this case at least).

Ekopalypse

What about using this
(?s)((<<)\h+(["|'])(\w+?)\3\h*;.*?\4)

Ekopalypse

is the boost:regex convention to denote match group 3
and
defines which match group actually should be painted

Like if you have:

r'(word1)(word2)(word3)', [2,3]

would mean that only word2 and word3 would be painted
whereas if you would specify

r'(word1)(word2)(word3)', [0]

everything would be colored.

Does this makes sense to you?

Gilles Maisonneuve

@Ekopalypse

I don’t understand your regexp syntax. Perhaps too ‘pythonized’ for me.

(?s) : what does it mean ? is it ‘s///’ ? or really a non capturing group of ‘s’ ???
\3 \4 : are they $3 $4, I don’t think as I can’t see a 4th accumulator

Ekopalypse

(?s) is a modifier telling the engine that the dot matches line endings
and yes, the engine uses \1 and $1

Here the link to the documentation - maybe easier for you.

Ekopalypse

ooppps

(?s)((<<)\h+(["|'])(\w+?)\3\h*;.*?\3)

:-D

Gilles Maisonneuve

This post is deleted!

Gilles Maisonneuve

@Ekopalypse

Ok
another one: in Python you must say ["|'] instead of Perl ["'] (‘either one of the set’) ? Is that what it means ?

Ekopalypse

No, afaik non-capturing group is (?:pattern)
This, (?s), just tells the engine that the dot . is matching
EOLs like \r\n - if I’m right.

Ekopalypse

Just for clarification, the python script does NOT use the python regex engine instead
it uses the one notepad++ offers, the boost::regex.
Yes, you can use the enumeration without the pipe but makes it more visible for me with
the pipe sign. Or is there a difference if used with pipe sign or without?

Ekopalypse

or maybe this one might be even better
(?s)(<<)\h+(["'])(\w+?)\2\h*;.*?\3

Gilles Maisonneuve

Can’t reply what I wanted, a robot says I’m spamming…

Ekopalypse

@Gilles-Maisonneuve

Can’t reply what I wanted, a robot says I’m spamming…

I have no idea why this happens sometimes.

By the way, now that you have installed pythonscript plugin would you mind
clicking Plugins->Python Script->Scripts->Samples->RegexTester ?

I know not everyone is recommending it but, personally, I love it.

Gilles Maisonneuve

AFAIK, at least in Perl, ["|'] means double-quote OR pipre OR simple-quote, everything between square brakets is literal. Also true in “awk” and C regexp I think.
I don’t know for Python.

Gilles Maisonneuve

@Ekopalypse

Now, if I say in Pyhton (attempt to transliterate from Perl) :

(r'(?s)(\h*(<<)\h*["|']?([^"|^']+?)["|']?\h*;.*?\3)', [2])

does it mean :

form REGEXP
do not match NL with DOT
matches any horizontal blanks (0 or more), don’t make a group
matches ‘<<’ make it a group
matches any horizontal blanks (0 or more), don’t make a group
matches 0 or 1 text quote (either double or single), no group
matches a group of any chars not " nor ’ one or more time(s) (in perl it would be [^"'])
matches 0 or 1 text quote (either double or single), no group
possible blanks until semi-colon, semi-colon, then possible chars until NL

BUT THEN, what does mean ?\3. I’m lost there.

Gilles Maisonneuve

a slash m

Ekopalypse

the r at the beginning just informs python that this is a raw string and
every char must be taken literally otherwise backslashes would be treated
as escapes under some circumstances.

The regex string is only this part

(?s)(\h*(<<)\h*["|']?([^"|^']+?)["|']?\h*;.*?\3)

and I would say, but as said - not an regex expert at all,

(?s) means Dot matches newline characters
the first matching group is

(\h*(<<)\h*["|']?([^"|^']+?)["|']?\h*;.*?\3)

the second

(<<)

and the third must be

([^"|^']+?)

if I’m right.

\3 should be the same as $3 in perl

Gilles Maisonneuve

@Ekopalypse

still confused: ([^"|^']+?) why a ‘?’ after the ‘+’ what’s for this ‘?’

and then \3 would mean the 3rd matching group (third ‘()’) but in Perl is used only in subsitutions. What is the use here ? There are only 2 groups in the regex (two blocks surrounded by parenthèses only.