Ruby: string processing functions

String processing functions
1. Return the length of the string

str.length => integer

 

str.include? other_str => true .include?    .include?    .include? ?h     

 

3. String insertion:

str.insert(index, other_str) =>.insert(0, )    .insert(3, )    .insert(4, )    .insert(-3, -3, )   .insert(-1, )   

 

4. String separation. The default Delimiter is space.

str.split(pattern=$;, [limit]) =>.split        .split(%r{,\s*}) .split(//)               .split(//, 3)            .split(%r{\s*})         .split()   .split()         .split(, 4)      

5. String replacement

str.gsub(pattern, replacement) =>|match| block } =>.gsub(/[aeiou]/, )              .gsub(/([aeiou])/, )         .gsub(/./) {|s| s[0].to_s +  }   

str.replace(other_str) =>=          s.replace    

 

str.delete([other_str]+) =>.delete ,        .delete             .delete ,    .delete           

 

7. Remove leading and trailing Spaces

str.lstrip =>.lstrip   .lstrip       

 

8. String Matching

str.match(pattern) => matchdata  nil

 

9. String Inversion

str.reverse =>.reverse   

 

10. Remove duplicate characters

str.squeeze([other_str]*) =>.squeeze                  .squeeze( )         .squeeze()   

 

11. Convert to numbers

str.to_i=>.to_i             

 

Differences between chomp and chop:
Chomp: Remove \ n or \ r at the end of the string.
Chop: removes the last character at the end of the string, whether it is \ n \ r or a common character.

.chomp            .chomp          .chomp        .chomp        .chomp          .chomp()     .chop   .chop   .chop     .chop       

Reprinted from: http://blog.163.com/ma95221@126/blog/static/2482210220100159515220/

 

Author: Civil Engineering (http://www.cnblogs.com/hongfei)

Address: http://www.cnblogs.com/hongfei/p/3688198.html