Regular expression for numeric with special characters Only

Question

I am looking for a Regular expression to match only numeric strings with special characters and of size 4+. I did a little review on the questions posted in here:

Testing website: http://regexlib.com/RETester.aspx

1- regular expression for numeric and special chacter check

Solution: ^((?!.*?\d)(?!.*?[^\w\s]).)+$

I tried this regular expression on:

155-555: No match (wrong)
155555: No match (wrong)

2- Regular Expression to match a string of numbers including special characters

Solution: ([-()_.+ ]*\d[-()_.+ ]*){4,}

155-555: match (correct)
155555: match (correct)
155-555aaa: match (wrong)

This regular expressions matched the previous strings. But there is an error. The third string 155-555aaa contains alphabet letters and not special characters. We should have no match for 155-555aaa since a is not a special character. How can I modify this regular expression to only match numeric string with special characters. The numeric string can be of any form:

example: 24332-2432@2342-1234

Special Characters : [&~#"{'[(|-`_\ç^à@)]}=}^¨$$*%ù]

numeric = digits

What's a "special character"? Is ぷ special?

MSalters
– MSalters

2014-01-28 11:28:35 +00:00
Commented Jan 28, 2014 at 11:28 — MSalters
– MSalters, Commented Jan 28, 2014 at 11:28
ok Special Characters: [&~#"{'[(|-`_\ç^à@)]}=}^¨$$*%ù]

Hani Goc
– Hani Goc

2014-01-28 11:29:05 +00:00
Commented Jan 28, 2014 at 11:29 — Hani Goc
– Hani Goc, Commented Jan 28, 2014 at 11:29
How about How about: [^a-zA-Z]{4,}?

Uri Y
– Uri Y

2014-01-28 11:29:13 +00:00
Commented Jan 28, 2014 at 11:29 — Uri Y
– Uri Y, Commented Jan 28, 2014 at 11:29

Bojangles · Accepted Answer · 2014-01-28 11:59:30Z

5

Just match anything that isn't [a-zA-Z] (with a length of 4 or more):

^[^a-z\s]{4,}$

Here is a test on RegexPal.

edited Jan 28, 2014 at 11:59

answered Jan 28, 2014 at 11:28

Bojangles

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4 Comments

Bojangles Over a year ago

Yes, hence [^a-z] as opposed to [a-z]

Dane Over a year ago

He negates all letters, but also matches the beginning (^) and the end ($) of the string, which is how he prevents "155-555aaa" from being a match.

Dane Over a year ago

Note that spaces will also match this negation, so (3 4 5 6 7 8) is a match, as are (1 2) and even just a bunch of spaces.

Bojangles Over a year ago

@Dane thanks for the heads up. I've edited my answer so the regex now rejects whitespace

MSalters · Accepted Answer · 2014-01-28 11:35:39Z

1

With the update special characters=[&~#"{'[(|-``_\ç^à@)]}=}^¨$*%ù] the class for "special or digit" becomes just [0-9&~#"{'[(|-``_\ç^à@)]}=}^¨$*%ù] and the full regex becomes ^[0-9&~#"{'[(|-``_\ç^à@)]}=}^¨$*%ù]{4,}$.

But it's rather suspicious that ù is special and ú isn't.

answered Jan 28, 2014 at 11:35

MSalters

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