Why does javascript replace only first instance when using replace

Question

I have this   var date       Date   val      this get the value in the textbox what would look like this  12 31 2009  Now I do this on it  var id    c     date replace             and the result is   c 1231 2009  It misses the last     I don t understand why though

User · Answer

You can use   String prototype replaceAll   function search  replace    if  replace     undefined        return this toString      return this split search  join replace

User · Answer

You need to set the g flag to replace globally   date replace new RegExp       g           or date replace     g        Otherwise only the first occurrence will be replaced

User · Answer

Unlike the C   NET class library  and most other sensible languages   when you pass a String in as the string-to-match argument to the string replace method  it doesn t do a string replace  It converts the string to a RegExp and does a regex substitution  As Gumbo explains  a regex substitution requires the g lobal flag  which is not on by default  to replace all matches in one go   If you want a real string-based replace     for example because the match-string is dynamic and might contain characters that have a special meaning in regexen     the JavaScript idiom for that is   var id   c   date split      join

[javascript] Why does javascript replace only first instance when using replace?

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