php - Regular Expression for nickname

Question

I am really newbie at RegExp's and I can't build it right now, so I've reffered to Stack Overflow.

Rules:

1. Can contains from 6 up to 15 symbols
2. Symbols can be latin letters, numbers, underline charachter.
3. Nickname must begin from letter

I don't know how to make this regular expression. I need to use it in Javascript and PHP, so I need solution for each platforms.

Answer 1

これは開始するためのものですが、微調整して必要なものに適応させる必要があります。

[a-zA-Z]\w{5,14}
^       ^
|       match an alphanumeric or underscore character 5 to 14 times
|
match a single alphabetic character

Answer 2

以下を使用できます。

/^[A-Za-z][A-Za-z0-9_]{5,14}$/

PHP と JS の両方で動作するはずです。