How do you match a hyphen in regex?
use “\p{Pd}” without quotes to match any type of hyphen. The ‘-‘ character is just one type of hyphen which also happens to be a special character in Regex.
How do you add a hyphen to a regular expression in Java?
Inside character class – denotes range. e.g. 0-9 . If you want to include – , write it in beginning or ending of character class like [-0-9] or [0-9-] . You also don’t need to escape .
Is there a regexp escape function in JavaScript?
Escaping / makes the function suitable for escaping characters to be used in a JavaScript regex literal for later evaluation. As there is no downside to escaping either of them, it makes sense to escape to cover wider use cases. And yes, it is a disappointing failing that this is not part of standard JavaScript.
How do you denote special characters in regex?
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches “.” ; regex \+ matches “+” ; and regex \( matches “(” . You also need to use regex \\ to match “\” (back-slash).
Do we need to escape hyphen in regex?
You only need to escape the dash character if it could otherwise be interpreted as a range indicator (which can be the case inside a character class).
How do you escape a dash?
With out the backslash, sed isn’t interpreting the dash as a hyphen. Looks to me like you are not properly escaping the hyphen. You need a back slash before the character to use as an escape character. This will properly escape the hyphen.
How do I check if a string has a hyphen?
java. lang. String has a String#contains() method that does this for you: Returns true if and only if this string contains the specified sequence of char values.
Which characters must be escaped in regex?
Operators: * , + ,? , | Anchors: ^ , $ Others: . , \ In order to use a literal ^ at the start or a literal $ at the end of a regex, the character must be escaped.
How do you escape special characters?
Escape Characters
Use the backslash character to escape a single character or symbol. Only the character immediately following the backslash is escaped. Note: If you use braces to escape an individual character within a word, the character is escaped, but the word is broken into three tokens.
Is Hyphen a special character?
A special character is a character that is not an alphabetic or numeric character.
…
Keyboard special characters.
| Key/symbol | Explanation |
|---|---|
| – | Hyphen, minus, or dash. |
| _ | Underscore. |
| + | Plus. |
| = | Equal. |
What does \\ mean in regex?
\\. matches the literal character . . the first backslash is interpreted as an escape character by the Emacs string reader, which combined with the second backslash, inserts a literal backslash character into the string being read. the regular expression engine receives the string \.
What does the dash mean in regex?
The dash operator means “match a range of characters or numbers”. The “a” and “z” are merely an example. It could also be 0–9, 5–8, F–M, etc.
Is a hyphen considered a special character?
How do I remove all hyphens from a string in Java?
Use the replaceAll() method to remove all hyphens from a string, e.g. const hyphensRemoved = str. replaceAll(‘-‘, ”); . The replaceAll method will remove all hyphens from the string by replacing them with empty strings.
How do you handle a hyphen in SQL?
The double hyphen places a single-line comment in a SQL*Plus script. The double hyphen works the same way as REMARK, except that it may be used in SQL statements and PL/SQL blocks. When used in a SQL statement or PL/SQL block, the double hyphen may be used to add trailing comments to a line.
Do dashes need to be escaped regex?
What characters need to be escaped JavaScript?
There are some reserved single character escape sequences for use in strings:
- \b : backspace (U+0008 BACKSPACE)
- \f : form feed (U+000C FORM FEED)
- \n : line feed (U+000A LINE FEED)
- \r : carriage return (U+000D CARRIAGE RETURN)
- \t : horizontal tab (U+0009 CHARACTER TABULATION)
- \v : vertical tab (U+000B LINE TABULATION)
How do you escape characters in JavaScript?
Javascript uses ‘\’ (backslash) in front as an escape character. To print quotes, using escape characters we have two options: For single quotes: \’ (backslash followed by single quote) For double quotes: \” (backslash followed by double quotes)
Is hyphen a special character in regex?
In regular expressions, the hyphen (“-“) notation has special meaning; it indicates a range that would match any number from 0 to 9. As a result, you must escape the “-” character with a forward slash (“\”) when matching the literal hyphens in a social security number.
What is the difference between hyphen and dash?
A hyphen joins two or more words together while a dash separates words into parenthetical statements. The two are sometimes confused because they look so similar, but their usage is different. Hyphens are not separated by spaces, while a dash has a space on either side.
How do I escape a character in regex?
The backslash character ( \ ) is the escaping character. It can be used to denote an escaped character, a string, literal, or one of the set of supported special characters. Use a double backslash ( \\ ) to denote an escaped string literal.
What does \b mean in regex?
word boundary
With some variations depending on the engine, regex usually defines a word character as a letter, digit or underscore. A word boundary \bdetects a position where one side is such a character, and the other is not.
Is hyphen a non ASCII character?
Hyphen (” – “, MOS:HYPHEN) (actually the hyphen-minus character in ASCII or Unicode character sets) are used in many ways on Wikipedia. They are the only short, horizontal dash-like character available as a separate key on most keyboards.
How do I remove a hyphen in regex?
How do I remove all special characters from a string?
Example of removing special characters using replaceAll() method
- public class RemoveSpecialCharacterExample1.
- {
- public static void main(String args[])
- {
- String str= “This#string%contains^special*characters&.”;
- str = str.replaceAll(“[^a-zA-Z0-9]”, ” “);
- System.out.println(str);
- }