question: public String findInterlanguageLink ( String lang ) { int start = page . indexOf ( "[[" + lang + ":" ) ; if ( start < 0 ) return null ; int end = page . indexOf ( "]]" , start ) ; if ( end < 0 ) return null ; String link = page . substring ( start + 3 + lang . length ( ) , end ) ; if ( link . indexOf ( "\n" ) != - 1 ) { return null ; } if ( link . length ( ) == 0 ) return null ; return link ; }
target:  Returns the inter-language link to a specific language (if any).