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java.lang.IllegalArgumentException: Illegal group reference	at java.util.regex.Matcher.appendReplacement(	at org.apache.commons.mail.ImageHtmlEmail.replacePattern(	at org.apache.commons.mail.ImageHtmlEmail.buildMimeMessage(	at org.apache.commons.mail.Email.send(	at undefined.EmailSender.sendHTMLEmail(	at undefined.EmailSenderTest.testImageHtmlEmailDollarBackslash(