Using the following way, we can easily replace a backslash in Java. The list of Java escape sequences: Why will we need Escape sequence? Hi, I am trying to escape backslash using regular expression in javascript. Backslash escapes and backslash brings; it actually toggles on or off the metacharacter vs. literal status of the character in front of it. The Backslash as an Escape Character: 18.4.4. Each escape character is a valid character literal. The String#replaceAll() interprets the argument as a regular expression.The \ is an escape character in both String and regex.You need to double-escape it for regex: string.replaceAll("\\", "\\\\"); But you don’t necessarily need regex for this, simply because you want an exact character-by-character replacement and you don’t need patterns here. Sometimes logical solutions can be unintuitive. Convert a name in the form 'first middle last' into the 'last, middle first' format So new RegExp gets a string without backslashes. Java Regex - Example - Character \\ Match - The character \\ matches the backslash character present in a text. Escaping (outside character classes) The important point you need to note is that a single \\ is substituted as single backslash i.e. Saying that backslash is the "escape" character is a bit misleading. In this case you could also use Pattern.quote. The total number of escape sequences or escape characters in Java is 8. A character with a backslash (\) just before it is an escape sequence or escape character. A Java regular expression syntax uses the backslash character as escape character, just like Java Strings do. So to match a backslash, you need \\ in the regex and thus \\\\ in the Java string literal. REGEXP_REPLACE(x, pattern [, replace_string [, start [, occurrence [, match_option]]]]) searches x for pattern and replace it with replace_string: 18.4.5. Saying that backslash is the "escape" character is a bit misleading. improve this answer. Is it possible to escape backslash using regular expression because "replace function " does not seem to make a difference in output. This gives a little challenge when writing a regular expression in a Java string. If you want to replace a single backslash in Java using replaceAll there are multiple layers of escaping that leads to four backslashes as an argument for replaceAll.. Backslashes. how to remove single backslash from string in java, To avoid this sort of trouble, you can use replace (which takes a plain string) instead of replaceAll (which takes a regular expression). You will still need to escape backslashes, but not in the wild ways required with regular expressions. We use escape characters to perform some specific task. Backslash escapes and backslash brings; it actually toggles on or off the metacharacter vs. literal status of the character in front of it. we need to escape it. See this link please: link. The replaceAll() method, as you know, takes two parameters out of which, the first one is the regular expression (aka regex) and the next one is the replacement. In order to use a literal backslash anywhere in a regex, it must be escaped by another backslash. answered Nov 9 '09 at 15:45. In order to use a literal backslash anywhere in a regex, it must be escaped by another backslash. The regex language has its own escape sequence on top of the Java string literal escape sequence. Hyphen. Look at this regular expression example: String regex = "\\. It does not show backslash in the console but it does in the return value. Is the back slash escaped or do I need to try any other way. 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