Even a simple path, like C:\Program Files (x86)\Vendor\Product\app.exe, contains several special characters. If you want to turn that into a regular expression (or part of a regular expression), you would need to escape not only the backslashes but also the parentheses and the period (d...
Escapes a minimal set of characters (\, *, +, ?, |, {, [, (,), ^, $, ., #, and white space) by replacing them with their escape codes. This instructs the regular expression engine to interpret these characters literally rather than as metacharacters.
3. Escaping Meta Characters with Backslash (\) A backslash is used to escape a meta-character, making it a literal character in the pattern. For example, \\. matches a literal dot (‘.’) character. // Matches the literal dot character Pattern pattern = Pattern.compile("\\."); Matcher...
A backslash \ is used in regular expressions to escape the next character. This allows us to include reserved characters such as { } [ ] / \ + * . $ ^ | ? as matching characters. To use one of these special character as a matching character, prepend it with \. For example, the ...
2.7 Escaping Special CharactersA backslash \ is used in regular expressions to escape the next character. This allows us to include reserved characters such as { } [ ] / \ + * . $ ^ | ? as matching characters. To use one of these special character as a matching character, prepend it...
Metacharacters are characters with a special meaning: CharacterDescriptionExampleTry it []A set of characters"[a-m]"Try it » \Signals a special sequence (can also be used to escape special characters)"\d"Try it » .Any character (except newline character)"he..o"Try it » ...
|Matches a specific character or group of characters on either side (e.g. a|b corresponds to a or b) \Used to escape a special character aThe character "a" abThe string "ab" QuantifiersDescription *Used to match 0 or more of the previous (e.g. xy*z could correspond to "xz", "...
The reason is that grafana uses a single backslash to encode meta characters in regular expressions. Prometheus expects a double backslash for proper encoding. A single backslash is interpreted as escape character starting an escape sequence. This behavior is very unlikely to ever change in Prometheus...
Escapes a minimal set of characters (\, *, +, ?, |, {, [, (,), ^, $,., #, and white space) by replacing them with their escape codes. This instructs the regular expression engine to interpret these characters literally rather than as metacharacters. Namespace: System.Text....
In general, it's prudent to single quote your regular expression so the shell leaves it alone. As a side note, I don't think your C program is representative of how the shell processes arguments; inShell Operation,quotingis a separate step and includes backslash processing (seeEscape Charact...