// Storage for regular expressions
SVG.regex = {
  // Parse unit value
  numberAndUnit: /^([+-]?(\d+(\.\d*)?|\.\d+)(e[+-]?\d+)?)([a-z%]*)$/i,

  // Parse hex value
  hex: /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i,

  // Parse rgb value
  rgb: /rgb\((\d+),(\d+),(\d+)\)/,

  // Parse reference id
  reference: /#([a-z0-9\-_]+)/i,

  // splits a transformation chain
  transforms: /\)\s*,?\s*/,

  // Whitespace
  whitespace: /\s/g,

  // Test hex value
  isHex: /^#[a-f0-9]{3,6}$/i,

  // Test rgb value
  isRgb: /^rgb\(/,

  // Test css declaration
  isCss: /[^:]+:[^;]+;?/,

  // Test for blank string
  isBlank: /^(\s+)?$/,

  // Test for numeric string
  isNumber: /^[+-]?(\d+(\.\d*)?|\.\d+)(e[+-]?\d+)?$/i,

  // Test for percent value
  isPercent: /^-?[\d.]+%$/,

  // Test for image url
  isImage: /\.(jpg|jpeg|png|gif|svg)(\?[^=]+.*)?/i,

  // split at whitespace and comma
  delimiter: /[\s,]+/,

  // The following regex are used to parse the d attribute of a path

  // Matches all hyphens which are not after an exponent
  hyphen: /([^e])-/gi,

  // Replaces and tests for all path letters
  pathLetters: /[MLHVCSQTAZ]/gi,

  // yes we need this one, too
  isPathLetter: /[MLHVCSQTAZ]/i,

  // matches 0.154.23.45
  numbersWithDots: /((\d?\.\d+(?:e[+-]?\d+)?)((?:\.\d+(?:e[+-]?\d+)?)+))+/gi,

  // matches .
  dots: /\./g
}