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- Difference between . , ? and * in regular expressions?
You may be confusing regular expressions with shell globs In regular expression syntax represents any single character (usually excluding the newline character), while * is a quantifier meaning zero or more of the preceding regex atom (character or group) ? is a quantifier meaning zero or one instances of the preceding atom, or (in regex variants that support it) a modifier that sets the
- regex - Regular expression that will catch strings containing 2 . . .
The regex explainer here will help to decipher it It will find a string with "must-" at the start followed by at least one lowercase-letter, number, dash, or dot; then "best" followed by at least one letter or dot
- ModuleNotFoundError: No module named regex. _regex
It looks like the Regex module in this case is bundled with the whole software and NOT from the system repos or PyPI Unfortunately, that makes solving this very limited Are you working in a venv or something? As it currently reads, it looks like you're doing everything from source code and that'll make it very very difficult to fix debug
- How to use invert match regex in sed? like grep - Ask Ubuntu
How to use invert match regex in sed? like grep Ask Question Asked 2 years, 2 months ago Modified 2 years, 2 months ago
- regex - Pattern based, batch file rename in terminal - Ask Ubuntu
No Action: show what files would have been renamed rename MAY take regex as the arguments What we are looking at is the content between the single quotes ' You can place regex separated by Formula: s (1) (2) where (1) = search pattern, and (2) = replace pattern So, familiarize youself with regex, and enjoy pattern based batch file renaming!
- Failed to create user due to regular expression error
This Ask Ubuntu thread discusses a regular expression error encountered while creating a user and provides solutions to address the issue
- adduser. conf NAME_REGEX is not working - Ask Ubuntu
After testing several of the above regular expressions for NAME_REGEX with no success (html code is hiding some \ characters, at least), I managed to write a proper and working one including the period symbol, just like this: NAME_REGEX="^[a-z][-a-z0-9_\ ]*\$?$" This means: Begin with a-z, followed by any number of dashes or a-z or 0-9 or underscores or periods, and may be ended with an
- Using rename, keeping part of the search regex - Ask Ubuntu
Modify the command in this way: rename 's ([0-9])a $1 1 ' * The substitution command s <souce> <replacement> will replace the source string (that could be a regular expression) with the replacement string The capture groups - the parts of the source string that are enclosed with brackets: (regexp), (string), etc will be assigned as values of successive variables: $1, $2, etc So, within
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