question: private FormatString [ ] parse ( String s ) { ArrayList < FormatString > al = new ArrayList < > ( ) ; Matcher m = fsPattern . matcher ( s ) ; for ( int i = 0 , len = s . length ( ) ; i < len ; ) { if ( m . find ( i ) ) { if ( m . start ( ) != i ) { checkText ( s , i , m . start ( ) ) ; al . add ( new FixedString ( s . substring ( i , m . start ( ) ) ) ) ; } al . add ( new FormatSpecifier ( m ) ) ; i = m . end ( ) ; } else { checkText ( s , i , len ) ; al . add ( new FixedString ( s . substring ( i ) ) ) ; break ; } } return al . toArray ( new FormatString [ al . size ( ) ] ) ; }
target:  Finds format specifiers in the format string.