# loads and instantiates a class which may be inefficient depending on context
java.lang.Class#forName(java.lang.String)

# String methods which uses regexes for matching
java.lang.String#replace(java.lang.CharSequence,java.lang.CharSequence)
java.lang.String#split(java.lang.String)
java.lang.String#split(java.lang.String,int)
java.lang.String#replaceAll(java.lang.String,java.lang.String)
java.lang.String#replaceFirst(java.lang.String,java.lang.String)

