Regex expression using PHP preg_match 1

[webslinga]

Hey all,
I need to check for a string and see if it matches EXACTLY three digits from 0 - 9.

I am thinking that it will be something like this:
/d{3} OR [0-9]{3} but it simply does not work. Please let me know what I am doing wrong. Thanks.

 

[sleipnir214]

Either of

\d{3}

[0-9]{3}

should work to match three digits in succession. But what do you mean by "EXACTLY"?

If you mean "The string should exist entirely of three digits", then the above strings won't work, as they will, for example, match "0000", since a string of four digits certainly includes a string of three digits. To match all strings that exist in their entireties as only three digits, try:

^\d{3}$

or

^[0-9]{3}$



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[webslinga]

Thanks sleipnir,
^[0-9]{3}$ worked for me. And you were correct in assuming that I wanted to match all strings that exist in their entireties as only three digits. Thanks a lot.