wro4j-core/src/main/java/ro/isdc/wro/util/StringUtils.java
private static String replace(final String inString, final String oldPattern,
      final String newPattern) {
    if (!hasLength(inString) || !hasLength(oldPattern) || newPattern == null) {
      return inString;
    }
    final StringBuffer sbuf = new StringBuffer();
    // output StringBuffer we'll build up
    int pos = 0; // our position in the old string
    int index = inString.indexOf(oldPattern);
    // the index of an occurrence we've found, or -1
    final int patLen = oldPattern.length();
    while (index >= 0) {
      sbuf.append(inString.substring(pos, index));
      sbuf.append(newPattern);
      pos = index + patLen;
      index = inString.indexOf(oldPattern, pos);
    }
    sbuf.append(inString.substring(pos));
    // remember to append any characters to the right of a match
    return sbuf.toString();
  }
private static String replace(final String inString, final String oldPattern,
      final String newPattern) {
    if (!hasLength(inString) || !hasLength(oldPattern) || newPattern == null) {
      return inString;
    }
    final StringBuffer sbuf = new StringBuffer();
    // output StringBuffer we'll build up
    int pos = 0; // our position in the old string
    int index = inString.indexOf(oldPattern);
    // the index of an occurrence we've found, or -1
    final int patLen = oldPattern.length();
    while (index >= 0) {
      sbuf.append(inString.substring(pos, index));
      sbuf.append(newPattern);
      pos = index + patLen;
      index = inString.indexOf(oldPattern, pos);
    }
    sbuf.append(inString.substring(pos));
    // remember to append any characters to the right of a match
    return sbuf.toString();
  }
Replace all occurrences of a substring within a string with another string.

@param inString
String to examine
@param oldPattern
String to replace
@param newPattern
String to insert
@return a String with the replacements