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Check first character of a string

/ Published in: JavaScript
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Checks if the first char of a string is a : letter, number, dot ( . ), arond ( @ ), underscore ( _ ).

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  1. function isLetter($a) {
  2. 	$inta=$a.charCodeAt('0');
  3. 	if($inta>=97&&$inta<=122)
  4. 		return true;
  5. 	return false;
  6. }
  7.  
  8. function isNumber($a) {
  9. 	$inta=$a.charCodeAt('0');
  10. 	if($inta>=48&&$inta<=57)
  11. 		return true;
  12. 	return false;
  13. }
  14.  
  15. function isDot($a) {
  16. 	if($a.charCodeAt('0')==46)
  17. 		return true;
  18. 	return false;
  19. }
  20.  
  21. function isArond($a) {
  22. 	if($a.charCodeAt('0')==64)
  23. 		return true;
  24. 	return false;
  25. }
  26.  
  27. function isUnderscore($a) {
  28. 	if($a.charCodeAt('0')==95)
  29. 		return true;
  30. 	return false;
  31. }

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