regex-group

问题 (https://stackoverflow.com/a/2304626/6607497 and https://stackoverflow.com/a/37004214/6607497 did not help me) Analyzing a problem with /proc/stat in Linux I started to write a small utility, but I can't get the capture groups the way I wanted. Here is the code: #!/usr/bin/perl use strict; use warnings; if (open(my $fh, '<', my $file = '/proc/stat')) { while (<$fh>) { if (my ($cpu, @vals) = /^cpu(\d*)(?:\s+(\d+))+$/) { print "$cpu $#vals\n"; } } close($fh); } else { die "$file: $!\n"; } For

问题 I have the following code: echo "12. Chapter Name" | sed -n -E "s/([0-9]{2})\.[[:space:]].*/\1/p" It prints 12 as expected, since \1 refers to the first capturing group. However, if \0 is used instead of \1 , the output is 12. Chapter Name , the entire input string is printed. It seems that as long as the regex found a match, \0 prints the entire input string. Is this correct? I'm running Debian 10.2. 回答1: The \0 is a placeholder for the whole match value. Note that capturing group indices

问题 I have the following code: echo "12. Chapter Name" | sed -n -E "s/([0-9]{2})\.[[:space:]].*/\1/p" It prints 12 as expected, since \1 refers to the first capturing group. However, if \0 is used instead of \1 , the output is 12. Chapter Name , the entire input string is printed. It seems that as long as the regex found a match, \0 prints the entire input string. Is this correct? I'm running Debian 10.2. 回答1: The \0 is a placeholder for the whole match value. Note that capturing group indices

问题 Option Explicit Sub GetFromInbox() Dim olApp As Outlook.Application Dim olNs As Outlook.Namespace Dim olFldr As Outlook.MAPIFolder Dim olItms As Outlook.Items Dim olMail As Variant Dim i As Long Set olApp = New Outlook.Application Set olNs = olApp.GetNamespace("MAPI") Set olFldr = olNs.GetDefaultFolder(olFolderInbox).Folders("impMail") Set olItms = olFldr.Items olItms.Sort "Subject" For Each olMail In olItms If InStr(olMail.Subject, "SubjectoftheEmail") > 0 Then ThisWorkbook.Sheets("Fixings")

问题 Option Explicit Sub GetFromInbox() Dim olApp As Outlook.Application Dim olNs As Outlook.Namespace Dim olFldr As Outlook.MAPIFolder Dim olItms As Outlook.Items Dim olMail As Variant Dim i As Long Set olApp = New Outlook.Application Set olNs = olApp.GetNamespace("MAPI") Set olFldr = olNs.GetDefaultFolder(olFolderInbox).Folders("impMail") Set olItms = olFldr.Items olItms.Sort "Subject" For Each olMail In olItms If InStr(olMail.Subject, "SubjectoftheEmail") > 0 Then ThisWorkbook.Sheets("Fixings")

问题 The problem: using a hardcoded string, this works. However, using my dynamic content from $post_content, the regex returns an empty array. What I expect it to return is my expected output, where it gets all results from capture group 1 in an array from this this regex function. I have the following function: $post_content = (string)strstr($post_content, 'MyNeedle', true); If I print_r() the result of this function: "Je naam (verplicht) [text* your-test] Je e-mailadres (verplicht) [email* your

问题 Here is he link: https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/pig-latin. By using replace and regex: I have captured c , but I want to set it at the end of onsonant plus ay using the replace function in JavaScript Here is my code: function translatePigLatin(str) { let regEx=/([bcd-fgh-klmn-pqrst-vwxyz])/i console.log(str.replace(regEx, '$1,')) } translatePigLatin("consonant"); 回答1: See if that's what you want function

问题 Is there a way to use a backreference to a previous capture group as the name of a named capture group ? This may not be possible, if not, then that is a valid answer. The following: $data = 'description: some description'; preg_match("/([^:]+): (.*)/", $data, $matches); print_r($matches); Yields: ( [0] => description: some description [1] => description [2] => some description ) My attempt using a backreference to the first capture group as a named capture group (?<$1>.*) tells me it's

问题 I have some links: utmcsr=rdstation|utmccn=curso-intro-coaching|utmcmd=inbound|utmctr=link3 utmcsr=rdstation|utmccn=agenda-psc|utmcmd=email utmcsr=rdstation|utmccn=pnl-porto-alegre I want to build a regex expression that matches the rdstation not followed by inbound OR email . I've tried rdstation(?!(email|inbound)) but it doesn't worked. 回答1: The problem is that your negative lookahead is anchored to the position directly after rdstation. It would only exclude strings like this:

问题 Why doesn't the \g<0> work with unicode regex? When I tried to use \g<0> to insert a space before and after the group with normal string regex, it works: >>> punct = """,.:;!@#$%^&*(){}{}|\/?><"'""" >>> rx = re.compile('[%s]' % re.escape(punct)) >>> text = '''"anständig"''' >>> rx.sub(r" \g<0> ",text) ' " anst\xc3\xa4ndig " ' >>> print rx.sub(r" \g<0> ",text) " anständig " but with unicode regex, the space isn't added: >>> punct = u""",–−—’‘‚”“‟„!£"%$'&)(+*-€/.±°´·¸;:=<?>@§#¡•[˚]»_^`≤…\«¿¨{}|