Javascript Regex - \\d works but not \d -

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This is why I am trying to exclude some real regx for the first time and I am told that ' \ D 'indicates matching of one digit.

Please someone can explain why only one pattern below works with a double back slash " \\ d ", t.

After viewing in the JavaScript Regular Expressions documentation, it includes a wicked back slash while following you. 

  var str = "123456", pattern1 = new RegExp ("^ \\ d {6} $"), pattern 2 = new RegExp ("^ \ d {6} $") ; If (pattern1.test (str)) {Warning ('Pattern 1 match!'); } And {warnings ('Pattern 1 no match!'); } If (pattern2.test (str)) {Warning ('Pattern Match 2!'); } And {warnings ('Pattern 2 is no match!'); }

You do not need to wrap a regular expression in quotes if you go ahead Grow and end /

Pattern 2 = New RegExp (/ ^ \ d {6} $ /);

Additional \ is required because it is in other \


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