Remove redundant RegExp character replace

Found by IntelliJ: https://www.jetbrains.com/help/phpstorm/regexp-redundant-character-escape.html

Author: koppor

src/main/java/org/jabref/logic/formatter/bibtexfields/HtmlToUnicodeFormatter.java

@@ -33,6 +33,6 @@ public String getExampleInput() {
     @Override
     public String format(String fieldText) {
         // StringEscapeUtils converts characters and regex kills tags
-        return StringEscapeUtils.unescapeHtml4(fieldText).replaceAll("\\<[^>]*>","");
+        return StringEscapeUtils.unescapeHtml4(fieldText).replaceAll("<[^>]*>","");
     }
 }

src/main/java/org/jabref/logic/layout/format/HTMLChars.java

@@ -20,7 +20,7 @@ public String format(String inField) {
                 .replaceAll("[\\n]{2,}", "<p>") // Replace double line breaks with <p>
                 .replace("\n", "<br>") // Replace single line breaks with <br>
                 .replace("\\$", "&dollar;") // Replace \$ with &dollar;
-                .replaceAll("\\$([^\\$]*)\\$", "\\{$1\\}"); // Replace $...$ with {...} to simplify conversion
+                .replaceAll("\\$([^$]*)\\$", "\\{$1\\}"); // Replace $...$ with {...} to simplify conversion
 
         StringBuilder sb = new StringBuilder();
         StringBuilder currentCommand = null;

src/main/java/org/jabref/logic/openoffice/OOPreFormatter.java

@@ -19,7 +19,7 @@ public String format(String field) {
         int i;
         String finalResult = field.replaceAll("&|\\\\&", "&") // Replace & and \& with &
                 .replace("\\$", "$") // Replace \$ with $
-                .replaceAll("\\$([^\\$]*)\\$", "\\{$1\\}"); // Replace $...$ with {...} to simplify conversion
+                .replaceAll("\\$([^$]*)\\$", "\\{$1\\}"); // Replace $...$ with {...} to simplify conversion
 
         StringBuilder sb = new StringBuilder();
         StringBuilder currentCommand = null;