Escaped Characters Regex
In a regular expression that is defined by using static text characters that are to be interpreted literally rather than as metacharacters can be escaped by preceding them with a backslash symbol as well as by calling the escape method.
Escaped characters regex. It converts to supported escape characters such as a b e n r f t. Converts any escaped characters in the input string. That is because some special characters are part of regular expression language and are considered are meta characters in regex so it s always a best practice to escape special characters.
After the comment below just thought i d mention the fact that you also have to consider the difference between finite state automata and non finite state automata when looking at the behaviour of regexp evaluation. For example it replaces x07 with a or x0a with n. Character escaping is what allows certain characters reserved by the regex engine for manipulating searches to be literally searched for and found in the input string.
What characters need to be escaped. Q indicates that all characters up to e needs to be escaped and e means we need to end the escaping that was started with q. There are other special characters as well that have special meaning in a regexp.
In the test shown here the split of the string class does a match using the regular expression provided to it. D so it s a special character in regexps just like in regular strings. Std regex and ruby require closing square brackets to be escaped even outside character classes.
This just means that whatever is in between q and e would be escaped. You could use regex unescape to visualize the original representation of the characters not the escaped representation. As we ve seen a backslash is used to denote character classes e g.
Btw character classes are pretty vanilla regexp components so they tend to work in most situations where you need escaped characters in regexps. I need to escape the regular expression special characters using java script how can i achieve this any help should be appreciated. The backslash in combination with a literal character can create a regex token with a special meaning.
Thanks for your quick reply but i need to escape all the special characters of regular expression i have try by this code but i can t achieve the result. It replaces the hexadecimal values in verbatim string literals with the actual printable characters. That is because the backslash is also a special character.
