Format swiss phone number

example

  # validating samples:
  #      783268674
  #     0783268674
  #  0410783268674
  # 00410783268674
  #  +410783268674
  #  041783268674
  # 0041783268674
  #  +41783268674
  # ++41783268674
  # ++41(0)783268674
  # (0)783268674
  swissPhoneRegex: /^(0041|041|\+41|\+\+41|41)?(0|\(0\))?([1-9]\d{1})(\d{3})(\d{2})(\d{2})$/


  # swissPhoneRegex is setup so we can also use it to format valid phone numbers consistently
  formatPhoneNumber: (phone) ->

    # regex is set up so we can easily format the matching parts
    phone = phone.replace(/[\s()]/g, "")
    res = @swissPhoneRegex.exec(phone)
    if res then "0#{ res[3] } #{ res[4] } #{ res[5] } #{ res[6] }" else ""

Needed a break from studying. Here's a stricter and compacter regex:

Take a look an non-capturing groups as they don't pollute your matches: (?:a|b) instead of (a|b).

Here's a visualization of the regexp 😉

swissPhoneRegex = /^(?:(?:|0{1,2}|\+{0,2})41(?:|\(0\))|0)([1-9]\d)(\d{3})(\d{2})(\d{2})$/

validNumbers = """
0783268674
41783268674
041783268674
0041783268674
+41783268674
++41783268674
++41(0)783268674
""".split('\n')

invalidNumbers = """
783268674
00783268674
1783268674
+041783268674
00041783268674
+++41783268674
04178326867
(0)783268674
++410783268674
""".split('\n')

formatPhoneNumber = (phone) ->
  phone = phone.replace(/\s/g, '')
  matches = swissPhoneRegex.exec(phone)
  matches && "0#{matches[1]} #{matches[2]} #{matches[3]} #{matches[4]}"

test = ->
  for i in validNumbers
    return false if formatPhoneNumber(i) != '078 326 86 74'
  for i in invalidNumbers
    return false if formatPhoneNumber(i)
  true

Da kollegä :D

^(0|0041|\+41)?[1-9\s][0-9\s]{1,12}$

matched au mit leerstelle

Da kollegä :D

^(0|0041|\+41)?[1-9\s][0-9\s]{1,12}$

Merci!

^(0|0041|\+41)?[1-9\s][0-9\s]{1,12}$ feels too greedy. For example, it matches 05 .

Btw, hi @peyerluk 👋 Nice to find your content when searching the interwebs 🙏

I have settled on this for the moment:

const internationalPhoneRegexp = /((\+|00)\d{8,30})/;

// Works for formatted mobile phone numbers like "078 326 86 74"
const swissPhoneRegexp1 = /(0[1-9]{2}\s[0-9]{3}\s[0-9]{2}\s[0-9]{2})/;

// Works for unformatted mobile phone numbers like "0783268674" and
// unformatted landline numbers like "041783268675"
const swissPhoneRegexp2 = /(0[0-9]{9,11})/;

const fullRegexp = new RegExp(
  [
    internationalPhoneRegexp.source,
    swissPhoneRegexp1.source,
    swissPhoneRegexp2.source,
  ].join('|'),
  'g'
);

It's not perfect, and will miss some formatting of phone numbers. However, it's less greedy, works for the formatted numbers that I currently care about and can be used without stripping whitespace.

It works for these test numbers:

• 0783268674
• 078 326 86 74
• 041783268675
• 0041783268674
• +41783268676
• +41783268677