Ruby gsub () gsub! ()

Gsub ()

The first parameter is Reg, and the second parameter is the character that is replaced.
Returns the changed string with no side effects on the original string.
No match will return the original string.

irb(main):001:0"regWord"=>"regWord"irb(main):002:0> str.gsub(/W/,‘w‘)=>"regword"irb(main):003:0> str=>"regWord"

gsub! ()

The original string is modified when there is a match.
Nil is returned when there is no match.

irb(main):004:0"regWord"=>"regWord"irb(main):005:0> str.gsub!(/W/,‘w‘)=>"regword"irb(main):006:0> str=>"regword"

Comprehensive comparison, gsub () better use a little

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Ruby gsub () gsub! ()