negative-lookbehind

问题 I'm trying to do a regex in stringr for a negative lookbehind in R. So basically, I have a text data that looks something like this : See item 7 Management's Discussion and Analysis. BlahBlahBlah. Item 7 Management's Discussion and Analysis. BlahBlahBlah. Item 8 Financial Statements and Supplementary Data. I want to select everything from the "Item 7" right after the "blahblahblah." sentence to "Item 8-Financial Statements and Supplementary Data" So I want Item 7 Management's Discussion and

问题 What I'm trying to accomplish I'm trying to create a function to use string interpolation within VBA. The issue I'm having is that I'm not sure how to replace "\n" with a vbNewLine , as long as it does not have the escape character "\" before it? What I have found and tried VBScript does not have a negative look behind as far as I can research. Below has two examples of Patterns that I have already tried: Private Sub testingInjectFunction() Dim dict As New Scripting.Dictionary dict("test") =

问题 What I'm trying to accomplish I'm trying to create a function to use string interpolation within VBA. The issue I'm having is that I'm not sure how to replace "\n" with a vbNewLine , as long as it does not have the escape character "\" before it? What I have found and tried VBScript does not have a negative look behind as far as I can research. Below has two examples of Patterns that I have already tried: Private Sub testingInjectFunction() Dim dict As New Scripting.Dictionary dict("test") =

问题 The pattern (?<!(asp|php|jsp))\?.* works in PCRE, but it doesn't work in Python. So what can I do to get this regex working in Python? (Python 2.7) 回答1: It works perfectly fine for me. Are you maybe using it wrong? Make sure to use re.search instead of re.match : >>> import re >>> s = 'somestring.asp?1=123' >>> re.search(r"(?<!(asp|php|jsp))\?.*", s) >>> s = 'somestring.xml?1=123' >>> re.search(r"(?<!(asp|php|jsp))\?.*", s) <_sre.SRE_Match object at 0x0000000002DCB098> Which is exactly how

问题 The pattern (?<!(asp|php|jsp))\?.* works in PCRE, but it doesn't work in Python. So what can I do to get this regex working in Python? (Python 2.7) 回答1: It works perfectly fine for me. Are you maybe using it wrong? Make sure to use re.search instead of re.match : >>> import re >>> s = 'somestring.asp?1=123' >>> re.search(r"(?<!(asp|php|jsp))\?.*", s) >>> s = 'somestring.xml?1=123' >>> re.search(r"(?<!(asp|php|jsp))\?.*", s) <_sre.SRE_Match object at 0x0000000002DCB098> Which is exactly how

问题 I'm looking to match bolded markdown. Here are some examples: qwer *asdf* zxcv matches *asdf* qwer*asdf*zxcv matches *asdf* qwer \*asdf* zxcv does not match *qwer* asdf zxcv matches *qwer* A negative look behind like this (?<!\\)\*(.*)\* works. Except there is no browser support in Firefox, so I cannot use it. Similarly, I can get very close with (^|[^\\])\*(.*)\* The issue is that there are two capture groups, and I need the index of the second capture group, and Javascript only returns the

问题 I'm looking to match bolded markdown. Here are some examples: qwer *asdf* zxcv matches *asdf* qwer*asdf*zxcv matches *asdf* qwer \*asdf* zxcv does not match *qwer* asdf zxcv matches *qwer* A negative look behind like this (?<!\\)\*(.*)\* works. Except there is no browser support in Firefox, so I cannot use it. Similarly, I can get very close with (^|[^\\])\*(.*)\* The issue is that there are two capture groups, and I need the index of the second capture group, and Javascript only returns the

问题 I need javascript regex that will match words that are NOT followed by space character and has @ before, like this: @bug - finds "@bug", because no space afer it @bug and me - finds nothing because there is space after "@bug" @bug and @another - finds "@another" only @bug and @another and something - finds nothing because both words are followed by space. Help? Added: string is fetched from and FF puts it's own tags at end of it. Although I basically need only the last word starting with @, $

问题 I need javascript regex that will match words that are NOT followed by space character and has @ before, like this: @bug - finds "@bug", because no space afer it @bug and me - finds nothing because there is space after "@bug" @bug and @another - finds "@another" only @bug and @another and something - finds nothing because both words are followed by space. Help? Added: string is fetched from and FF puts it's own tags at end of it. Although I basically need only the last word starting with @, $

问题 I need javascript regex that will match words that are NOT followed by space character and has @ before, like this: @bug - finds "@bug", because no space afer it @bug and me - finds nothing because there is space after "@bug" @bug and @another - finds "@another" only @bug and @another and something - finds nothing because both words are followed by space. Help? Added: string is fetched from and FF puts it's own tags at end of it. Although I basically need only the last word starting with @, $