RegExp | Thompson 's Construction Algorithm for Regular Expression | Regex library
kandi X-RAY | RegExp Summary
kandi X-RAY | RegExp Summary
Thompson’s Construction Algorithm for Regular Expression.
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Top functions reviewed by kandi - BETA
- Run test
- Fix postfix
- Replace post fix rules
- Append two states
- Apply the given state to the given fragment
- Create a new state list
- Get the precedence of the given character
- Performs a match on the given state
- Add a state to a list
- Move to next state
- Checks if the tranformation is match
- Starts a new state and returns it
RegExp Key Features
RegExp Examples and Code Snippets
Lines of Code : 14
License : No License
CopyLines of Code : 14License : No LicenseCopyconst get = (from, ...selectors) =>
[...selectors].map(s =>
s
.replace(/\[([^\[\]]*)\]/g, '.$1.')
.split('.')
.filter(t => t !== '')
.reduce((prev, cur) => prev && prev[cur], from)
);
const obj = const URLJoin = (...args) =>
args
.join('/')
.replace(/[\/]+/g, '/')
.replace(/^(.+):\//, '$1://')
.replace(/^file:/, 'file:/')
.replace(/\/(\?|&|#[^!])/g, '$1')
.replace(/\?/g, '&')
.replace('&', '?');
Community Discussions
Trending Discussions on RegExp
QUESTION
Here if search text matches the text of tag I want to hide other unmatched items.
Here what is happening is if the searched input does not match any thing then only the accordion disappears otherwise nothing happens.
I want to display only the accordion which matches the searched text and hide unmatched .How can I do it here ?
script
...ANSWER
Answered 2021-Jun-15 at 16:04This should be easy. its a little mistake that you did.
QUESTION
I am parsing a Wordpress shortcode and want to use PCRE mainly with a view to finally getting my head around it.
The following shortcode is one I wish to parse:
...ANSWER
Answered 2021-Jun-15 at 11:11If you want to match attributes with single-quoted arguments you can use
QUESTION
I want to know the cause of regexp not working properly.
...ANSWER
Answered 2021-Jun-15 at 05:29^[a-zA-Z]*$Match at least 0 or more of lowercase/uppercase letters from beginning to the end.a+C+a+2+3does not satisfy those requirements but an empty string does.^[0-9|*|+|/|-]*$Match at least 0 or more of digits,*,+,/or-from beginning to the end; thus will match1+2/33*4and an empty string too.
So, this might be the pattern you're looking for:
QUESTION
I am trying to get all numerical value (integers,decimal,float,scientific notation) from an expression and want to differentiate them from digits that are not realy number but part of a name. For example in the expression below.
...ANSWER
Answered 2021-Jun-15 at 04:23This should take care of it. (All the items are strings)
QUESTION
I have a string like this:
...ANSWER
Answered 2021-Jun-14 at 17:55Creating a regex using const regex = new RegExp( will generate a regex like \\b{${i}}\\b, 'g')/\b{0}\b/ and is not a valid expression.
Also, you are not overwriting the value of message, and you do not need a new RegExp to do the replacements.
You can use the counter between the curly braces to get the string to replace using {${i}}
QUESTION
I was taking freecodecamp.org course on JavaScript data structures, going through the RegExp chapter. I then came across the following assertion:
"The regular expression /(?=\w{3,6})(?=\D*\d)/ will check whether a password contains between 3 and 6 characters and at least one number".
(Here "check" meaning that regExp.test(password) returns true)
This seems odd to me. First of all, looking around in Stack Exchange, I found in this post that states that A(?=B) is the definition of positive lookahead, and it makes no mention that A (the preceeding expression in the parenthesis) is optional. So, shouldn't freecodecamp's example have an expression before the first lookahead?
I believe that this another example is quite similar to the previously mentioned, but simpler so I will mention it in case the explanation is simpler, too:
Why does (?=\w)(?=\d), when checked against the string "1", returns true?, Shouldn't it look for an alphanumeric character followed by a numeric character?
PS: After a thought, I hypothesized that my first example checks both lookahead patterns independently (i.e. first it checks whether the string is made of three to six characters, returns true, then checks whether there is an alpha numeric character, and finally since both searchings returned true, the whole regexp test returns true). But this doesn't seem to be coherent with the definition mentioned in the post I've linked. Is there a more general definition or algorithm which the computer "internally" uses to deal with lookaheads?
...ANSWER
Answered 2021-Jun-14 at 16:03Lookaround are similar to word-boundary metacharacters like \b or the anchors ˆ and $ in that they don’t match text, but rather match positions within the text.
Positive lookahead peeks forward in the text to see if its subexpression can match, and is successful as a regex component if it can. Positive lookahead is specified with the special sequence (?=...).
An important thing to understand about lookaround constructs is that although they go through the motions to see if their subexpression is able to match, they don’t actually “consume” any text.
QUESTION
Here is what i want to do: I want to replace certain tokens in a string, but only if they are not inside another word. Example:
...ANSWER
Answered 2021-Jun-14 at 14:49Assuming you want to replace pos only as a standalone word, just use word boundaries:
QUESTION
I am trying to write a regular expression for an ID which comes in the following formats:
7_b4718152-d9ed-4724-b3fe-e8dc9f12458a
b4718152-d9ed-4724-b3fe-e8dc9f12458a
[a_][b]-[c]-[d]-[e]-[f]
a- optional 0-3 digits followed by an underscore if there's at least a digit (if there is underscore is required)b- 8 alphanumeric charactersc- 4 alphanumeric charactersd- 4 alphanumeric characterse- 4 alphanumeric charactersf- 12 alphanumeric characters
I have came up with this regexp but I would appreciate any guidance and/or corrections. I am also not too sure how to handle the optional underscore in the first segment if there are no digits up front.
/([a-zA-Z0-9]{0,3}_[a-zA-Z0-9]{8}-[a-zA-Z0-9]{4}-[a-zA-Z0-9]{4}-[a-zA-Z0-9]{4}-[a-zA-Z0-9]{12})+/g
ANSWER
Answered 2021-Jun-14 at 07:27Your regex looks good. To optionally match the first 3 digits with an underscore, you can wrap that group with ()?. Also you can force the presence of a digit before the underscore by using {1,3} instead of {0,3}.
Unless you expect that multiple identifiers are following each other without space and should be matched as one, you can drop the last + (for multiple matches on the same line, you already have the g option).
The final regex is ([a-zA-Z0-9]{1,3}_)?[a-zA-Z0-9]{8}-[a-zA-Z0-9]{4}-[a-zA-Z0-9]{4}-[a-zA-Z0-9]{4}-[a-zA-Z0-9]{12}
See here for a complete example.
If you also do not need to capture the individual 4-alphanumeric groups, you can simplify your regex into:
([a-zA-Z0-9]{1,3}_)?[a-zA-Z0-9]{8}-([a-zA-Z0-9]{4}-){3}[a-zA-Z0-9]{12}
See here for an example.
QUESTION
I'm facing a strange error when I try to execute a find near with pageable in Mongodb and spring boot. My collection have 5 stores. When I call the method with the params: Page 0 and Page Size of 5 or below it works. But when I call it with a PageSize equals or greather than the total of stores I get this error. I noticed that the error occurs when the spring data mongo calls the method doCount internally but I have no idea what is wrong.
Below is my code and the error:
----- Models ----
...ANSWER
Answered 2021-Jun-13 at 12:13Guys I solved the problem. In my controller I was passing a GeoJsonPoint as parameter. When I changed to a Point it worked.
---- Before ----
QUESTION
How can I iterate backwards a regexp's MatchCollection? The following code doesn't work (VBA-MSWORD)
Set mtch = foundmatches(m) gives 'Invalid procedure call or argument (Error 5)'
ANSWER
Answered 2021-Jun-13 at 22:27Like this, as the Matches collection is zero-based
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install RegExp
You can use RegExp like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the RegExp component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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