find_yamamichiwo.jsx

var targetObj = [];

var docObj = activeDocument;
for (var i = 0; i < docObj.pageItems.length; i++) {
    typ = docObj.pageItems[i].typename;
    if (typ != "TextFrame") continue;
    targetObj.push(docObj.pageItems[i]);
}

for (var i = 0; i < targetObj.length; i++) {
    if (targetObj[i].contents.match(/山路を登りながら/)) {
        change_fillcolor(targetObj[i], getRandomInt(0, 255), getRandomInt(1, 255), getRandomInt(0, 255));
        change_textSize(targetObj[i], getRandomInt(1, 5) * 100);
        targetObj[i].opacity = 100;
        targetObj[i].zOrder(ZOrderMethod.BRINGTOFRONT);
    }
}

function change_fillcolor(obj, r, g, b) {
    var my_color = new RGBColor();
    my_color.red = r;
    my_color.green = g;
    my_color.blue = b;
    obj.textRange.characterAttributes.fillColor = my_color;		//　塗りの色を指定
}

function change_textSize(obj, size) {
    obj.textRange.characterAttributes.size = size;
}

function getRandomInt(min, max) {
    min = Math.ceil(min);
    max = Math.floor(max);
    return Math.floor(Math.random() * (max - min)) + min; //The maximum is exclusive and the minimum is inclusive
}