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I am using codeigniter and I want to check user input with regular expression for phone number. My pattern is [+]zero or one and [0-9] number.
Following format,
+959250142935
09250142935
This is my pattern - /\+?[0-9]$/
This does not work as I expected.

You can use the following pattern to check for valid phone number. There is a additional {5,} to set a minimum length of the phone number (in this case 5), so the phone number can't be a single number:
^[\+]{0,1}[0-9]{5,}$ or ^[\+]{0,1}\d{5,}$
You can use this pattern directly on the <input>:
<input pattern="^[\+]{0,1}[0-9]{5,}$" type="text"/>
<input pattern="^[\+]{0,1}\d{5,}$" type="text"/>

Try with this regex
/^(\+|0|1)\d+$/
If the number must be certaing length
/^(\+|0|1)\d{10}$/