Regular expression for number with length of 4 5 or 6

Question

I need a regular expression that validate for a number with length 4  5  6  I used   0-9  4  to validate for a number of 4  but I do not know how to include validation for 5 and 6

User · Answer

If the language you use accepts     you can use  0-9  4 6    If not  you ll have to use  0-9  0-9  0-9  0-9  0-9   0-9

User · Answer

Be aware that  as written  Peter s solution will  accept  0000  If you want to validate numbers between 1000 and 999999  then that is another problem  -     1-9  0-9  3 5     for example will block inserting 0 at the beginning of the string   If you want to accept 0 padding  but only up to a lengh of 6  so that 001000 is valid  then it becomes more complex  If we use look-ahead then we can write something like       0-9  4 6   0  1-9  0-9  3      This first checks if the string is long 4-6     0-9  4 6     then skips the 0s 0 and search for a non-zero  1-9  followed by at least 3 digits  0-9  3

User · Answer

0-9  4 6  can be shortened to  d 4 6

User · Answer

Try this     0-9  4 6      4 6    between 4 and 6 characters  inclusive

[javascript] Regular expression for number with length of 4, 5 or 6

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