wro4j-core/src/main/java/ro/isdc/wro/util/WroUtil.java
public static String loadRegexpWithKey(final String key) {
    InputStream stream = null;
    try {
      stream = WroUtil.class.getResourceAsStream("regexp.properties");
      final Properties props = new RegexpProperties().load(stream);
      return props.getProperty(key);
    } catch (final IOException e) {
      throw new WroRuntimeException("Could not load pattern with key: " + key + " from property file", e);
    } finally {
      closeQuietly(stream);
    }
  }
public static String loadRegexpWithKey(final String key) {
    InputStream stream = null;
    try {
      stream = WroUtil.class.getResourceAsStream("regexp.properties");
      final Properties props = new RegexpProperties().load(stream);
      return props.getProperty(key);
    } catch (final IOException e) {
      throw new WroRuntimeException("Could not load pattern with key: " + key + " from property file", e);
    } finally {
      closeQuietly(stream);
    }
  }
Load the regular expression stored in in regexp.properties resource file.

@param key
the key of the regexp to load.
@return regular expression value.