core/strings.js

  1. const decimalRegex = /^[-+]?\d*(\.\d+|\d*)(e[-+]?\d+)?$/
  2. const hexRegex = /^[-+]?[a-f0-9]+$/
  3. const octRegex = /^[-+]?[0][0-7]+$/
  4. const binRegex = /^[-+]?[01]+$/
  5. const emailRegex = /^[a-z0-9]([a-z0-9._%-+][a-z0-9]|[a-z0-9])*@[a-z0-9]([a-z0-9.-][a-z0-9]|[a-z0-9])*\.[a-z]{2,6}$/i
  6. /**
  7.  * @module core/strings
  8.  * @memberOf core
  9.  */
  12. /**
  13.  * String is decimal number
  14.  * @param {String} str
  15.  * @return {boolean}
  16.  */
  17. function isDecimal(str) {
  18.     return decimalRegex.test(str);
  19. }
  21. /**
  22.  * String is binary number
  23.  * @param {String} str
  24.  * @return {boolean}
  25.  */
  26. function isBinary(str) {
  27.     return binRegex.test(str);
  28. }
  30. /**
  31.  * String is octal number
  32.  * @param {String} str
  33.  * @return {boolean}
  34.  */
  35. function isOctal(str) {
  36.     return octRegex.test(str);
  37. }
  39. /**
  40.  * String is hexadecimal number
  41.  * @param {String} str
  42.  * @return {boolean}
  43.  */
  44. function isHex(str) {
  45.     return hexRegex.test(str);
  46. }
  48. /**
  49.  * String is valid email address
  50.  * @param {String} str
  51.  * @return {boolean}
  52.  */
  53. function isEmail(str) {
  54.     return emailRegex.test(str);
  55. }
  57. /**
  58.  * String starts with sequence polyfill
  59.  * @param {String} str
  60.  * @param {String} seq
  61.  * @return {boolean}
  62.  */
  63. function startsWith(str, seq) {
  64.     return str.indexOf(seq) === 0;
  65. }
  67. /**
  68.  * String ends with sequence polyfill
  69.  * @param {String} str
  70.  * @param {String} seq
  71.  * @return {boolean}
  72.  */
  73. function endsWith(str, seq) {
  74.     return str.indexOf(seq) === seq.length-1;
  75. }
  77. /**
  78.  * String contains sequence
  79.  * @param {String} str
  80.  * @param {String} seq
  81.  * @return {boolean}
  82.  */
  83. function contains(str, seq) {
  84.     return str.indexOf(seq)>=0;
  85. }
  87. module.exports = {isDecimal, isHex, isOctal, isBinary, isEmail,startsWith, endsWith, contains};