CODEWITHSUNDEEP
regex
Paul
Paul

Reputation: 5974

regex help, only one hyphen in a row?

I want to accept 0-9 , and -

So I have:

[0-9-,]+

However I only want there to be ever one - in a row, so you can't have --. How can I do this?

Upvotes: 1

Views: 129

Answers (3)

Naveed S
Naveed S

Reputation: 5236

I think required one is this:

^\d+(-\d+)?(,\d+(-\d+)?)*$

What this does is:

\d+ any integer (one or more digits)

(-\d+)? optional part matching a - followed by an integer

(,\d+(-\d+)?)* zero or more occurrence of a , followed by combination of above mentioned patterns.

Note: Add required escaping for \

Upvotes: 2

Kent
Kent

Reputation: 195029

is this ok ?

^[0-9,]*-?[0-9,]*$

just did a small test with grep:

kent$  echo "1-234-
1234-
3-24442-34
12341234"|grep -E '^[0-9,]*-?[0-9,]*$'
1234-
12341234

Upvotes: 0

Tim Pietzcker
Tim Pietzcker

Reputation: 336098

Use a lookahead assertion:

(?!.*--)[0-9,-]+

Also, you might need to use anchors to ensure that the entire string is matched:

^(?!.*--)[0-9,-]+$

Upvotes: 2

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