正则表达式 - 简单的电话号码验证

Question

I need to check / replace a Phone number in a Form Field with regex and it should really be simple. I can't find Solutions in this Format:

"place number"
so: "0521 123456789"

Nothing else should work. No special Characters, no country etc.
Just "0521 123456789"

Would be great if someone could provide a solution as I'm not an Expert with regex (and PHP).

Answer 1

You can use the following RegEx:

^0[1-9]\d{2}\s\d{9}$

That will match it how it is exactly

<kbd>Live Demo on RegExr</kbd>

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How it works:

^        # String Starts with ...
0        # First Digit is 0
[1-9]    # Second Digit is from 1 to 9 (i.e. NOT 0)
\d{2}    # 2 More Digits
\s       # Whitespace (use a [Space] character instead to only allow spaces, and not [Tab]s)
\d{9}    # Digit 9 times exactly (123456789)
$        # ... String Ends with