javascript 関数

.js

String.prototype.before = function(word, include){
    var idx = this.indexOf(word)
    var l = include ? word.length : 0
    return idx >= 0 ?
        this.substr(0, idx + l) :
        ""
}
String.prototype.after = function(word, include){
    var idx = this.indexOf(word)
    var l = include ? 0 : word.length
    return idx >= 0 ?
        this.substr(idx + l) :
        ""
}