I want to Match the Content between '(' and ')' of
Path()
Path(C:\...)
with
(?<=^Path\()(.*)(?=\))
In Notepad++ it matches '' <-- zero length match and 'C:...'.
But using Delphi XE3:
if TRegEx.IsMatch(pDef, '(?<=^Path\()(.*)(?=\))') then begin
does only match 'C:\...' but I need the empty match.
Try with that regex:
Path\((.*)\)
This also match the empty match, as in your example.
Online Demo
Delphi's TRegEx skips all zero-length matches. See QC104562 for details.
Your regex will work with Delphi's TPerlRegEx if you exclude preNotEmpty from the State property.
That said, using lookaround to try to isolate part of the regex match results in inefficient regexes. Much better to use something like Path\(([^)\r\n]*)\) or Path\((.*)\) and retrieve the text matched by the first capturing group to get the actual path. The first regex will correctly match Path(...) when there are additional ) characters on the same line but will not correctly handle paths that contain ) characters.
Related
I'd like to know how can I ignore characters that follows a particular pattern in a Regex.
I tried with positive lookaheads but they do not work as they preserves those character for other matches, while I want them to be just... discarded.
For example, a part of my regex is: (?<DoubleQ>\"\".*?\"\")|(?<SingleQ>\".*?\")
in order to match some "key-parts" of this string:
This is a ""sample text"" just for "testing purposes": not to be used anywhere else.
I want to capture the entire ""sample text"", but then I want to "extract" only sample text and the same with testing purposes. That is, I want the group to match to be ""sample text"", but then I want the full match to be sample text. I partially achieved that with the use of the \K option:
(?<DoubleQ>\"\"\K.*?\"\")|(?<SingleQ>\"\K.*?\")
Which ignores the first "" (or ") from the full match but takes it into account when matching the group. How can I ignore the following "" (")?
Note: positive lookahead does not work: it does not ignore characters from the following matches, it just does not include them in the current match.
Thanks a lot.
I hope I got your questions right. So you want to match the whole string including the quotes, but you want to replace/extract it only the expression without the quotes, right?
You typically can use the regex replace functionality to extract just a part of the match.
This is the regex expression:
""?(.*?)""?
And this the replace expression:
$1
I am trying to create a regex expression to parse till \. Can you tell me how to create a regex expression.
The code i had created was
/[^\]*/
I find regex101.com really useful for testing regex.
I think you just need an extra backslash...
/[^\\]*/
If you want to get everything until a slash, just use:
/(.*?)\\/
(.*?) Capture group, containing the text until slash (not included)
.* Match everything 0 or more times.
? make the quantifier (*) lazy, so it matches only until the first slash if there are more than one.
Check this: http://regexr.com/3cnld
I'm trying to filter words which is not in the "[ ]".
Why is this not working?
[^\[][\u0000-\u024F]+[^\]]
The reason your expression is not working is that it matches all text inside brackets as well as outside.
This is the best I've been able to do:
/(?:^|])[^[]+/g
It includes the ]s in the match because look-behind is not allowed:
http://regexr.com/3c515
If look-behind were allowed, this would be the ticket:
/(?:^|(?<=]))[^[]+/g
https://regex101.com/r/lK9tS7/3
Because this will match [\u0000-\u024F]+ and 2 character which will be matches by [^\[]. If you want to your regex engine match the whole of pattern you need to use start and end anchors in your regex :
/^[^\[][\u0000-\u024F]+[^\]]$/m
But this will work if your string is contain words in each line, which is not a proper way.
As a better way you can use negative look arounds :
(?<!\[)[\u0000-\u024F]+(?!\])
I have following input string
Testing <B><I>bold italic</I></B> text.
and following regex :
<([A-Z][A-Z0-9]*)\b[^>]*>.*</\1>
This regex only gives following larger match
<B><I>bold italic</I></B>
How to use regex to get the smaller match ?
<I>bold italic</I>
I tried using non-greedy operators, but it didn't worked either.
And Is it possible to get both as match groups using like java or c# match groups or match collections ?
Try the below regex which uses positive lookbehind,
(?<=>)<([A-Z][A-Z0-9]*)\b[^>]*>.*<\/\1>
DEMO
It looks for the tag which starts just after to the > symbol.
Explanation:
(?<=>) Positive lookbehind is used here, which sets the matching marker just after tp the > symbol.
< Literal < symbol.
([A-Z][A-Z0-9]*\b[^>]*>) Captures upto the next > symbol.
.* Matches nay character except \n zero or more times.
<\/\1> Matches the lietral </+first captured group+>
As you probably know, many people prefer using a DOM parser to parse html. But looking at your existing regex, to fix it, I would suggest this:
<([A-Z][A-Z0-9]*)\b[^<>]*>[^<]*</\1>
See the demo.
Explanation
Inside the tags, inside of the .* that match too many chars, we use [^<]*, which matches any chars that are not an opening tag. That way we won't go into another tag.
Likewise, I changed your [^>]* to [^<>]* so we don't start another tag
I assume you will make this case-insensitive
The initial string is [image:salmon-v5-09-14-2011.jpg]
I would like to capture the text "salmon-v5-09-14-2011.jpg" and used GSkinner's RegEx Tool
The closest I can get to my desired output is using this RegEx:
:([\w+.-]+)
The problem is that this sequence includes the colon and the output becomes
:salmon-v5-09-14-2011.jpg
How can I capture the desired output without the colon. Thanks for the help!
Use a look-behind:
(?<=:)[\w+.-]+
A look-behind (coded as (?<=someregex)) is a zero-width match, so it asserts, but does not capture, the match.
Also, your regex may be able to be simplified to this:
(?<=:)[^\]]+
which simply grabs anything between (but not including) a : and a ]
If you are always looking at strings in that format, I would use this pattern:
(?<=\[image:)[^\]]+
This looks behind for [image:, then matches until the closing ]
You have the correct regex only the tool you're using is highlighting the entire match and not just your capture group. Hover over the match and see what "group 1" actually is.
If you want a slightly more robust regex you could try :([^\]]+) which will allow for any characters other than ] to appear in the file name portion.