/**
*   不是正则替换，效率是不是会低些
*/
public static String replace(String inString, String oldPattern, @Nullable String newPattern) {
    if (!hasLength(inString) || !hasLength(oldPattern) || newPattern == null) {
        return inString;
    }
    int index = inString.indexOf(oldPattern);
    if (index == -1) {
        // no occurrence -> can return input as-is
        return inString;
    }

    int capacity = inString.length();
    // 为什么 + 16
    if (newPattern.length() > oldPattern.length()) {
        capacity += 16;
    }
    StringBuilder sb = new StringBuilder(capacity);

    int pos = 0;  // our position in the old string
    int patLen = oldPattern.length();
    while (index >= 0) {
        sb.append(inString.substring(pos, index));
        sb.append(newPattern);
        pos = index + patLen;
        index = inString.indexOf(oldPattern, pos);
    }

    // append any characters to the right of a match
    sb.append(inString.substring(pos));
    return sb.toString();
}