Example Application of Regular Expression in BBEdit / TextWrangler

gist_regular_expression4textwrangler.txt

——————— Group Pattern and Use Found Patterns ———————————————————————————————————————————————————————
see https://gist.github.com/ccstone/5385334 for further details on definition of regular expression

(1) Search Example:
    enwiki: 'https://en.wikipedia.org',
    dewiki: 'https://de.wikipedia.org',
    roa_rupwiki: 'https://roa-rup.wikipedia.org',
  
(2) Replace Example: 
    enwiki: 'https://en.wikipedia.org',
    enwikipedia: 'https://en.wikipedia.org',  
    dewiki: 'https://de.wikipedia.org',
    dewikipedia: 'https://de.wikipedia.org',
    roa_rupwiki: 'https://roa-rup.wikipedia.org',
    roa_rupwikipedia: 'https://roa-rup.wikipedia.org',
 
(3) Search - Regular Expression: 
    ([a-z_]+)wiki: 'https://([a-z\-]+).wikipedia.org',
    
(4) Replace - Regular Expression: 
    \1wiki: 'https://\2.wikipedia.org',\n  \1wikipedia: 'https://\2.wikipedia.org',

(5) Comments for Regular Expression:
\n newline
\1 first matched group (e.g. "en" or "de" or "roa_rup" as part of the wiki ID
\2 first matched group (e.g. "en" or "de" or "roa-rup" as part of the URL
( ) Brackets group the pattern for reuse in the replace definition 
    escape brackets with \( or \) if you have brackets in your pattern

The regular expressions in BBEdit or TextWrangler are defined in Perl like way, see https://gist.github.com/ccstone/5385334 for further details on definition of regular expressions.