如何防止我的函数修改常量中的字符串？

Question

I have an issue with a RegEx pattern collection I am setting, along with many other resources, within an angular constant. In this example, the RegExPattern has a '\\' character, which angular is stripping from the string. This renders the pattern useless.

http://jsfiddle.net/beauxjames/u8sevn6k/

.constant('appConfig', {
    RegExPattern: '^\d{9}$'     
})

I am familiar with $sce and safely encoding HTML, but not from within a constant.

What are my options here?

Answer 1

Backslashes have to be escaped in strings...

.constant('appConfig', {
    RegExPattern: '^\\d{9}$'     
})

Or you can use a regex literal

.constant('appConfig', {
    RegExPattern: /^\d{9}$/
})

EDIT:

This has nothing to do with angular, javascript does this by itself (uses backslash as escape character)

Check this fiddle for yourself

Answer 2

双\\ RegExPattern: '^\\\\d{9}$'