Saying that backslash is the "escape" character is a bit misleading. Java Regex - Example - Character \\ Match - The character \\ matches the backslash character present in a text. A Java regular expression syntax uses the backslash character as escape character, just like Java Strings do. The list of Java escape sequences: Why will we need Escape sequence? Escaping (outside character classes) Is the back slash escaped or do I need to try any other way. We use escape characters to perform some specific task. 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). So to match a backslash, you need \\ in the regex and thus \\\\ in the Java string literal. A character with a backslash (\) just before it is an escape sequence or escape character. Each escape character is a valid character literal. improve this answer. String quotes “consume” backslashes and interpret them on their own, for instance: \n – becomes a newline character, \u1234 – becomes the Unicode character with such code, …And when there’s no special meaning: like \d or \z, then the backslash is simply removed. Backslash escapes and backslash brings; it actually toggles on or off the metacharacter vs. literal status of the character in front of it. This gives a little challenge when writing a regular expression in a Java string. Using the following way, we can easily replace a backslash in Java. The Backslash as an Escape Character: 18.4.4. Is it possible to escape backslash using regular expression because "replace function " does not seem to make a difference in output. Look at this regular expression example: String regex = "\\. So new RegExp gets a string without backslashes. 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. Hyphen. Convert a name in the form 'first middle last' into the 'last, middle first' format Sometimes logical solutions can be unintuitive. The important point you need to note is that a single \\ is substituted as single backslash i.e. we need to escape it. Saying that backslash is the "escape" character is a bit misleading. The regex language has its own escape sequence on top of the Java string literal escape sequence. Backslash escapes and backslash brings; it actually toggles on or off the metacharacter vs. literal status of the character in front of it. Backslashes. It does not show backslash in the console but it does in the return value. Hi, I am trying to escape backslash using regular expression in javascript. You will still need to escape backslashes, but not in the wild ways required with regular expressions. See this link please: link. In this case you could also use Pattern.quote. In order to use a literal backslash anywhere in a regex, it must be escaped by another backslash. 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. answered Nov 9 '09 at 15:45. text.replaceAll(Pattern.quote(regex), Matcher.quoteReplacement(replacement)); REGEXP_REPLACE(x, pattern [, replace_string [, start [, occurrence [, match_option]]]]) searches x for pattern and replace it with replace_string: 18.4.5. The total number of escape sequences or escape characters in Java is 8. 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