Need a simple Regular Expressions here

Question

I'm finally parsing through wikipedias wiki text. I have the following type of text here:

{{Airport-list|the Solomon Islands}}

* '''AGAF''' (AFT) – [[Afutara Airport]] – [[Afutara]]
* '''AGAR''' (RNA) – [[Ulawa Airport]] – [[Arona]], [[Ulawa Island]]
* '''AGAT''' (ATD) – [[Uru Harbour]] – [[Atoifi]], [[Malaita]]
* '''AGBA''' – [[Barakoma Airport]] – [[Barakoma]]

I need to retrieve all lines in a single array which start with the pattern

* '''

I think a regular expression would be called to order here but I'm really messed up on my regular expressions part though.

Plus in another example I have the following text:

{{otheruses}}
{{Infobox Settlement
|official_name          = Doha
|native_name        = {{rtl-lang|ar|الدوحة}} ''ad-Dawḥa''
|image_skyline          = Doha Sheraton.jpg
|imagesize              = 
|image_caption          = West Bay at night
|image_map              = QA-01.svg
|mapsize                = 100px
|map_caption            = Location of the municipality of Doha within [[Qatar]].
|pushpin_map            =
|pushpin_label_position = 
|pushpin_mapsize        = 
|subdivision_type       = [[Countries of the world|Country]]
|subdivision_name       = [[Qatar]]
|subdivision_type1      = [[Municipalities of Qatar|Municipality]]
|subdivision_name1      = [[Ad Dawhah]]
|established_title      = Established
|established_date       = 1850
|area_total_km2         = 132
|area_total_sq_mi       = 51
|area_land_km2          = 
|area_land_sq_mi        = 
|area_water_km2         = 
|area_water_sq_mi       = 
|area_water_percent     = 
|area_urban_km2         = 
|area_urban_sq_mi       =
|area_metro_km2         = 
|area_metro_sq_mi       = 
|population_as_of       = 2004
|population_note        = 
|population_footnotes = <ref name=poptotal>[http://www.planning.gov.qa/Qatar-Census-2004/Flash/introduction.html Qatar 2004 Census]</ref>
|population_total       = 339847
|population_metro       = 998651
|population_density_km2 = 2574
|population_density_sq_mi = 6690
|latd=25 |latm=17 | lats=12 |latNS=N 
|longd=51|longm=32 | longs=0| longEW=E 
|coordinates_display    = inline,title
|coordinates_type       = type:city_region:QA
|timezone               = [[Arab Standard Time|AST]]
|utc_offset             = +3
|website                = 
|footnotes              = 
}} <!-- Infobox ends -->
'''Doha''' ({{lang-ar|الدوحة}}, ''{{transl|ar|ad-Dawḥa}}'' or ''{{unicode|ad-Dōḥa}}'') is the [[capital city]] of [[Qatar]].  It has a population of 400,051 according to the 2005 census,<ref name="autogenerated1">[http://www.hotelrentalgroup.com/Qatar/Sheraton%20Doha%20Hotel%20&%20Resort.htm Sheraton Doha Hotel & Resort | Hotel discount bookings in Qatar<!-- Bot generated title -->]</ref> and is located in the [[Ad Dawhah]] municipality on the [[Persian Gulf]].  Doha is Qatar's largest city, with over 80% of the nation's population residing in Doha or its surrounding [[suburbs]], and is also the economic center of the country. 
It is also the seat of government of Qatar, which is ruled by [[Sheikh Hamad bin Khalifa Al Thani]]–the current ruling Emir of Qatar. 

I need to extract the infobox here. The infobox is and includes all text between the first occurrence of

{{Infobox Settlement

and ends with the first occurrence of

}} <!-- Infobox ends -->

I'm totally lost when it comes to regular expressions and I could use help here. I'm using Php.

---

EDIT! HELP!

I've been battling for 40 hours and I can't get the stupid regular expression to work right :( so far I just have this:

{{Infobox[^\b(\r|\n)}}(\r|\n)\b]*[\b(\r|\n)}}(\r|\n)(\r|\n)\b]

But its not working I want it to read all the string data between {{infobox and ends with a \n}}\n

I'm using Php and can't get this to work :( It just returns the first occurrence of }} ignoring the fact that I want it to retrieve }} with preceding linefeed. Help please before I waste more of my sanity on this :'(

Answer 1

I need to extract the infobox ...

Try this, this time making sure dotall mode is enabled:

\{\{Infobox.*?(?=\}\} <!-- Infobox ends -->)

And again, explanation for that:

(?xs)    # x=comment mode, s=dotall mode
\{\{     # two opening braces (special char, so needs escaping here.)
Infobox  # literal text
.*?      # any char (including newlines), non-greedily match zero or more times.
(?=      # begin positive lookahead
\}\}     # two closing braces
<!-- Infobox ends --> # literal text
)        # end positive lookahead

This will match upto (but excluding) the the ending expression - you could remove the lookahead itself and include just the contents to have it include the ending, if necessary.

Update, based on comment to answer:

\{\{Infobox.*?(?=\n\}\}\n)

Same as above, but lookahead looks for two braces on their own line.

To optionally allow the comment also, use:

\{\{Infobox.*?(?=\n\}\}(?: <!-- Infobox ends-->)?\n)

Answer 2

I need to retrieve all lines in a single array which start with the pattern * '''

Enable multiline mode and ensure dotall mode is disabled, and use this:

^\* '''.*$

That expression dissected is:

(?xm-s) # Flags:
        # x enables comment mode (spaces ignore, hashes start comments)
        # m enables multiline mode (^$ match lines)
        # -s disables dotall (. matches newline)
^       # start of line
\*      # literal asterisk
[ ]     # literal space (needs braces in comment mode, but not otherwise)
'''     # three literal apostrophes
.*      # any character (excluding newline), greedily matched zero or many times.
$       # end of line

Answer 3

MediaWiki is open-source. Have a look at their source code ... ;-)

Answer 4

I think the best way is to merge all lines into one string, especially for the infobox.

Then something along the lines of

$reg = "\n(\* '''[^\n]*)";

for the first part (everything after a new line that start with * ''' and is not a new line).

And for the second part I'm not quire sure right now, but this is a nice place to play around a bit: http://www.solmetra.com/scripts/regex/index.php

And here is a short reference for regular expression syntax: http://www.regular-expressions.info/reference.html