Is there a way to construct a regular expression that will validate a string containing up to 12 digits only? Thank you!
Is there a way to construct a regular expression that will validate a string containing up to 12 digits only? Thank you!
/^[0-9]{0,12}$/
... explaining that ...
/ # beginning of regex
^ # anchor to start of the line
[0-9] # any digit from 0 to 9
{0,12} # repeated between 0 and 12 times
$ # anchor to end of the line
/ # end of regex
(?:^|[^0-9])([0-9]{1,12})(?![0-9])
The issue has been categorized into 3 parts based on the responses received.
(?:^|[^0-9]) indicates that it should begin with a non-digit character or no character at all
[0-9] specifies only digits should be consumed
{1,12} states up to 12 characters should be consumed
? implies observing but not consuming
![0-9] signifies any character can be accepted except for a digit.
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