Regex to match an optional '+' symbol followed by any number of digits

Question

I want a regular expression to match a string that may or may not start with plus symbol and then contain any number of digits. Those should be matched ``` +35423452354554 or 3423564564 ```

Accepted Answer

This should work

```
\+?\d+
```

Matches an optional `+` at the beginning of the line and digits after it

EDIT:

As of OP's request of clarification: 3423kk55 is matched because so it is the first part (3423). To match a whole string only use this instead:

```
^\+?\d+$
```

Regex to match an optional '+' symbol followed by any number of digits

Solution

Problem