how to write a regular expression to check whether a number is consisting only of 5 digits?
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how to write a regular expression to check whether a number is consisting only of 5 digits?
This regular expression should work nicely:
This will check if a string consists of only 5 numbers.
/is the delimiter. It is at the beginning and the end of a regular expression. (User-defined, you can use any character as delimiter).^is a start of string anchor.\dis a shorthand for[0-9], which is a character class matching only digits.{5}means repeat the last group or character5times.$is the end of string anchor./is the closing delimiter.If you want to make sure that the number doesn’t start with 0, you can use the following variant:
Where:
/is the delimiter. It is at the beginning and the end of a regular expression. (User-defined, you can use any character as delimiter).^is a start of string anchor.[1-9]is a character class matching digits ranging from1to9.\dis a shorthand for[0-9], which is a character class matching only digits.{4}means repeat the last group or character4times.$is the end of string anchor./is the closing delimiter.Note that using regular expressions for this kind of validation is far from being ideal.