wro4j-core/src/main/java/ro/isdc/wro/util/WroUtil.java
private static boolean startsWith(final String str, final String prefix, final boolean ignoreCase) {
    if (str == null || prefix == null) {
      return (str == null && prefix == null);
    }
    if (prefix.length() > str.length()) {
      return false;
    }
    return str.regionMatches(ignoreCase, 0, prefix, 0, prefix.length());
  }
private static boolean startsWith(final String str, final String prefix, final boolean ignoreCase) {
    if (str == null || prefix == null) {
      return (str == null && prefix == null);
    }
    if (prefix.length() > str.length()) {
      return false;
    }
    return str.regionMatches(ignoreCase, 0, prefix, 0, prefix.length());
  }
<p>
Check if a String starts with a specified prefix (optionally case insensitive).
</p>

@see java.lang.String#startsWith(String)
@param str
the String to check, may be null
@param prefix
the prefix to find, may be null
@param ignoreCase
indicates whether the compare should ignore case (case insensitive) or not.
@return <code>true</code> if the String starts with the prefix or both <code>null</code>