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I don't agree to make sure no letters are accepted -- go ahead and accept the, then just ignore them. People naturally write extensions with a leading "x" (eg: 555-1212 x123). Why not allow that? Humans can parse it just fine, and if the computer needs to use it, it can strip out the non-digits trivially.

Bryan Oakley
– Bryan Oakley

2012-02-03 17:35:26 +00:00
Commented Feb 3, 2012 at 17:35

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Correct minor typos or mistakes
Clarify meaning without changing it
Add related resources or links
Always respect the author’s intent
Don’t use edits to reply to the author

create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="https://example.com">example</a>

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