Regex Pattern Matching .Net

Question

I am trying the match the following possible scenarios. They are all phone numbers but they can be from anywhere in the world.

"92134"
"+234234"
"-234234"
"234(234)"
"(559) 559-5591 ext123"
"(559) 559-5591 EXT123"
"(559) 559-5591 Ext123"
"(559) 559-5591 x123"
"(559) 559-5591 X123"
"416.123.4567"

Now I'm not limiting the number of digits or anything but the key problems are the following.

Allow:

'()', '-', '.' anywhere in the string... start end e.t.c
'+' as the first character (Doesn't need to be though)
'ext', 'Ex't, 'EXT', 'X', 'x' only for the last set of digits. So not (559) 559 EXt5591 EXT123

Now I have wrote the following but I do not know enough about Regex to optimize it more and get the result i want.

@"^(?=[0-9])([-.+ Ee Xx Tt \s()0-9])+$"

Perhaps you should let the field be free and live happy

xanatos
– xanatos

2015-05-01 15:07:55 +00:00
Commented May 1, 2015 at 15:07 — xanatos
– xanatos, Commented May 1, 2015 at 15:07
I wish I could trust the clients that much :-(

LukeDev
– LukeDev

2015-05-01 15:10:53 +00:00
Commented May 1, 2015 at 15:10 — LukeDev
– LukeDev, Commented May 1, 2015 at 15:10

Tiller · Accepted Answer · 2015-05-01 15:21:06Z

1

You could use something like the following:

/^
(
(?:
    (?:^\+)               # matches the "+" sign at the beginning
  |
    (?:\(\d+\))           # matches '(' and its paired ')' but allows only digit inside
  |
    \d                    # matches a digit
  |
    [ .-]                 # matches a separator character
  |
    (?:(?>ext|x)\d{3}$)   # matches the EXT' part at the end
)+
)
$/ix

An example at: https://regex101.com/r/nC2vV4/1

answered May 1, 2015 at 15:21

Tiller

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6 Comments

LukeDev Over a year ago

Hi @Tiller, Thanks for the comment. Does this work for . net Regex also?

Tiller Over a year ago

I'm sorry I've never touched .Net ; However AFAIK it should. The only touchy thing I see that could fail is my "(?>...)" which you would just have to replace by "(?:...)" if so.

Tiller Over a year ago

I think it 'd be something like: @"(?i)^((?:(?:^\+)|(?:$\d+$)|\d|[ .-]|(?:(?>ext|x)\d{3}$))+)$"

LukeDev Over a year ago

Weird, I'm using regexhero.net/tester and I canb't match anything. There must be something that .net doesn't like.

Tiller Over a year ago

Everything works just fine for me on your website. Depending on what you're testing, you might want to activate the multiline-mode on the right side of your website.

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