Application of regular expression conversion case in JS

JS in the application of the regular expression conversion case, the code is very simple, see the code:

The following initials are capitalized, the other letters are lowercase

[JavaScript]View Plaincopy

2. <script type="Text/javascript" >
4. function Replacereg (reg,str) {
6. str = Str.tolowercase ();
8. return Str.replace (Reg,function (m) {return m.touppercase ()})
10. }
12. var reg =/\b (\w) |\s (\w)/g;
14. var str = ' share JavaScript ';
16. var str2 = ' SHARE JAVASCRIPT ';
18. var str3 = ' Test \ n str is no good! ';
20. var str4 = ' final Test ';
22. document.write (Replacereg (reg,str) +' <br/> ');
24. document.write (Replacereg (REG,STR2) +' <br/> ');
26. document.write (Replacereg (REG,STR3) +' <br/> ');
28. document.write (Replacereg (REG,STR4) +' <br/> ');
30. </script>

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The following initials are capitalized, and the other letters are not handled in any case.

[JavaScript]View Plaincopy < param name= "allowfullscreen" value= "false" >< param name= "wmode" value= "Transparent" >

1. <script language="JavaScript" >
2. <!--
3. var str="Xi nAn shi xUe yuan China people"
4. Alert (Str.replace (/\s[a-z]/g,function ($) {return $1.tolocaleuppercase ()}). replace (/^[a-
5. z]/,function ($) {return $1.tolocaleuppercase ()}))
6. -
7. </script>

Run the code, directly look at the effect is possible!

Application of regular expression conversion case in JS