Reputation: 31724
I am trying to write a regular expression which finds all the comments in text.
For example all between /* */
.
Example:
/* Hello */
When I do this:/\*.*\*/
, it behaves odd and nothing is shown. What is wrong with it?
EDIT: The comments can be spread across multiple lines
Upvotes: 24
Views: 35231
Reputation: 115
if you want to replace the obnoxious comment from flutter main.dart, Press cmd +r on mac or cntrl+ r on windows, type //.* into the box above, leave the box below empty click .* on the replace dialog, to activate regex, then click on replace all. this will remove all your comments, you can do this if you want to remove all comments in any file in a flutter. Additional, to reformat the main.dart press cmd+a on mac and cntrl+a on windows, then press cmd+alt(option)+l or cntrl+alt+l, this will reformat the code. I will attach a picture of the main. dart, the green .* at the top of the page is what you will press to activate the regex.
Upvotes: 1
Reputation: 165
The answer which user1919238 wrote works. Just corroborating that here, although the many upvotes probably do give you a clue. It got rid of all these annoying block comments, put here just to show the usefulness/thank user1919238 for saving time:
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align-items: center;\n}\n\n.main {\n  padding: 5rem 0;\n  flex: 1;\n  display: flex;\n  flex-direction: column;\n  justify-content: center;\n  align-items: center;\n}\n\n.footer {\n  width: 100%;\n  height: 100px;\n  border-top: 1px solid #eaeaea;\n  display: flex;\n  justify-content: center;\n  align-items: center;\n}\n\n.footer img {\n  margin-left: 0.5rem;\n}\n\n.footer a {\n  display: flex;\n  justify-content: center;\n  align-items: center;\n}\n\n.title a {\n  color: #0070f3;\n  text-decoration: none;\n}\n\n.title a:hover,\n.title a:focus,\n.title a:active {\n  text-decoration: underline;\n}\n\n.title {\n  margin: 0;\n  line-height: 1.15;\n  font-size: 4rem;\n}\n\n.title,\n.description {\n  text-align: center;\n}\n.description {\n  line-height: 1.5;\n  font-size: 1.5rem;\n}\n.descriptleft {\n  line-height:1.5;\n  font-size:1.5rem;\n  text-align:center;\n  text-justify: left;\n}\n.code {\n  background: #fafafa;\n  border-radius: 5px;\n  padding: 0.75rem;\n  font-size: 1.1rem;\n  font-family: Menlo, Monaco, Lucida Console, Liberation Mono, DejaVu Sans Mono,\n    Bitstream Vera Sans Mono, Courier New, monospace;\n}\n\n.grid {\n  display: flex;\n  align-items: center;\n  justify-content: center;\n  flex-wrap: wrap;\n  max-width: 800px;\n  margin-top: 3rem;\n}\n.correct {\n  margin: 1rem;\n  flex-basis: 45%;\n  padding: 1.5rem;\n  text-align: left;\n  color: inherit;\n  text-decoration: none;\n  text-emphasis: bold;\n  border: 1px solid lightgreen;\n  border-radius: 10px;\n  transition: color 0.15s ease, border-color 0.15s ease;\n}\n.correct:hover,\n.correct:focus,\n.correct:active {\n  color: green;\n  border-color: green;\n}\n.correct h3 {\n  margin: 0 0 1rem 0;\n  font-size: 1.5rem;\n}\n\n.correct p {\n  margin: 0;\n  font-size: 1.25rem;\n  line-height: 1.5;\n}\n.ok {\n  margin: 1rem;\n  flex-basis: 45%;\n  padding: 1.5rem;\n  text-align: left;\n  color: inherit;\n  text-decoration: none;\n  text-emphasis: bold;\n  border: 1px solid yellow;\n  border-radius: 10px;\n  transition: color 0.15s ease, border-color 0.15s ease;\n}\n.ok:hover,\n.ok:focus,\n.ok:active {\n  color: orange;\n  border-color: orange;\n}\n.ok h3 {\n  margin: 0 0 1rem 0;\n  font-size: 1.5rem;\n}\n\n.ok p {\n  margin: 0;\n  font-size: 1.25rem;\n  line-height: 1.5;\n}\n\n.card {\n  margin: 1rem;\n  flex-basis: 45%;\n  padding: 1.5rem;\n  text-align: left;\n  color: inherit;\n  text-decoration: none;\n  border: 1px solid #eaeaea;\n  border-radius: 10px;\n  transition: color 0.15s ease, border-color 0.15s ease;\n}\n\n.card:hover,\n.card:focus,\n.card:active {\n  color: #0070f3;\n  border-color: #0070f3;\n}\n.card h3 {\n  margin: 0 0 1rem 0;\n  font-size: 1.5rem;\n}\n\n.card p {\n  margin: 0;\n  font-size: 1.25rem;\n  line-height: 1.5;\n}\n\n.logo {\n  height: 1em;\n}\n.space2 {\n  line-height:2;\n}\n._215 {\n  line-height:2;\n  font-size: 1.25rem;\n  text-align: center;\n}\n.cyan {\n  color:cyan;\n}\n.magenta {\n  color:magenta;\n}\n.green {\n  color:green;\n}\n.red {\n  color:red;\n}\n.lcoral {\n  color: lightcoral;\n}\n.lsalmon{\n  color: lightsalmon\n}\n.greenyellow{\n  color: greenyellow;\n}\n.skyblue {\n  color:skyblue;\n}\n.blue {\n  color:blue;\n}\n\n\n\n\n@media (max-width: 600px) {\n  .grid {\n    width: 100%;\n    flex-direction: column;\n  }\n}\n"],"sourceRoot":""} */
Upvotes: 0
Reputation: 25840
You cannot write a regular expression that would be able to correctly find all comments, or even one type of comments - single-line or multiline.
Regular expressions can only provide a partial match, one that would would cover perhaps 90% of all cases, but that's it.
The syntax for regular expression is so complex, it is only possible to identify them correctly in 100% of cases by doing a full expression evaluation, which in turn is based on tokenizing the code. The latter is a huge task, which is implemented by all AST parsers today. See AST Explorer
Only a proper-written AST parser can tell you precisely where all regular expressions are located in your code. You would have to write a parser then based on that.
Or, you could use one of the existing libraries that already do all that, like decomment.
RegEx examples where any head-on approach is going to stumble, being unable to tell a regular expression from a comment block:
/\//
- it will think this reg-ex is a single-line comment/\/*/
- it will think this reg-ex opens a multi-line commentUpvotes: 0
Reputation: 5546
Just an additionnal note about using regex to remove comments inside a programming language file.
Warning!
Doing this you must not forget the case where you have the string /*
or */
inside a string in the code - like var string = "/*";
- (we never know if you parse a huge code that is not yours)!
So the best is to parse the document with a programming language and have a boolean to save the state of an open string (and ignore any match inside open string).
Again a string delimited by "
can contain a \"
so pay attention with the regex!
Upvotes: 2
Reputation: 25524
I encountered this problem several years ago and wrote an entire article about it.
If you don't have access to non-greedy matching (not all regex libraries support non-greedy) then you should use this regex:
/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*+/
If you do have access to non-greedy matching then you can use:
/\*(.|[\r\n])*?\*/
Also, keep in mind that regular expressions are just a heuristic for this problem. Regular expressions don't support cases in which something appears to be a comment to the regular expression but actually isn't:
someString = "An example comment: /* example */";
// The comment around this code has been commented out.
// /*
some_code();
// */
Upvotes: 8
Reputation:
Unlike the example posted above, you were trying to match comments that spanned multiple lines. By default, .
does not match a line break. Thus you have to enable multi-line mode in the regex to match multi-line comments.
Also, you probably need to use .*?
instead of .*
. Otherwise it will make the largest match possible, which will be everything between the first open comment and the last close comment.
I don't know how to enable multi-line matching mode in Sublime Text 2. I'm not sure it is available as a mode. However, you can insert a line break into the actual pattern by using CTRL + Enter. So, I would suggest this alternative:
/\*(.|\n)*?\*/
If Sublime Text 2 doesn't recognize the \n
, you could alternatively use CTRL + Enter to insert a line break in the pattern, in place of \n
.
Upvotes: 30