473,696 Members | 1,913 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Regular Expression to Match Blank Characters outside Multiline Comments

Hi, all,
I'm now writing a program to compress JavaScript code. One puzzle is how
to write a regular expression to find out and remove all the redundent blank
spaces. However, those blank spaces that are in the comments should be kept
intact.

I've tried to write some Regexs, and I list them here for your information:
regex = new Regex(@"/\*[\s\S]*?\*/"); // pattern used to match a multiline
comment block
regex = new Regex(@"//[^@\n]*\n"); // pattern used to match a single-line
comment
regex = new Regex(@"(?<!(?://[^\n]*))\s+"); // pattern used to match blank
characters outside single-line comments

Now the problem is how to match all the continuous blank characters outside
multiline comments?
regex = new Regex(@"(?<!(?:/\*[\s\S]*))\s+");
but this does not work, and will lead to a CPU dead-loop with no reaction
for a long time.

I'm a newbie in Regular Expression. Can sombody help me? Thanks a lot!

Best regards,
Laser L
Nov 17 '05 #1
1 7397
I wrote another one:

(?<=(?:\*/)(?:[^/\*]|(?<!/)\*|/(?!\*))*)\s+(?= (?:[^\*/]|(?<!\*)/|\*(?!/))*(?:/\*))|(?<=\A(?:[^/\*]|(?<!/)\*|/(?!\*))*)\s+(?= (?:[^\*/]|(?<!\*)/|\*(?!/))*(?:/\*))|(?<=(?:\*/)(?:[^/\*]|(?<!/)\*|/(?!\*))*)\s+(?= (?:[^\*/]|(?<!\*)/|\*(?!/))*\z)|(?<=\A(? :[^/\*]|(?<!/)\*|/(?!\*))*)\s+(?= (?:[^\*/]|(?<!\*)/|\*(?!/))*\z)
I did some simple test, and it works:)
Hi, all,
I'm now writing a program to compress JavaScript code. One puzzle is
how
to write a regular expression to find out and remove all the redundent
blank
spaces. However, those blank spaces that are in the comments should be
kept
intact.
I've tried to write some Regexs, and I list them here for your
information:
regex = new Regex(@"/\*[\s\S]*?\*/"); // pattern used to match a
multiline
comment block
regex = new Regex(@"//[^@\n]*\n"); // pattern used to match a
single-line
comment
regex = new Regex(@"(?<!(?://[^\n]*))\s+"); // pattern used to match
blank
characters outside single-line comments
Now the problem is how to match all the continuous blank characters
outside
multiline comments?
regex = new Regex(@"(?<!(?:/\*[\s\S]*))\s+");
but this does not work, and will lead to a CPU dead-loop with no
reaction
for a long time.

I'm a newbie in Regular Expression. Can sombody help me? Thanks a lot!

Best regards, Laser Lu


Nov 17 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

2
1797
by: Oriana | last post by:
Hi! I'm trying to 'clean up' this source file using regular expressions in Python. My problem is, that when I try to delete extra lines, my code fails. Here's an example.... /** * * Project: MyProject *
1
4172
by: Kenneth McDonald | last post by:
I'm working on the 0.8 release of my 'rex' module, and would appreciate feedback, suggestions, and criticism as I work towards finalizing the API and feature sets. rex is a module intended to make regular expressions easier to create and use (and in my experience as a regular expression user, it makes them MUCH easier to create and use.) I'm still working on formal documentation, and in any case, such documentation isn't necessarily the...
4
3222
by: Neri | last post by:
Some document processing program I write has to deal with documents that have headers and footers that are unnecessary for the main processing part. Therefore, I'm using a regular expression to go over each document, find out if it contains a header and/or a footer and extract only the main content part. The headers and the footers have no specific format and I have to detect and remove them using a list of strings that may appear as...
3
1410
by: Gianluca | last post by:
Hi, I'm using regular expressions to extract some information from my vb.net source code files. I have something like this: 1: '<class name="xyz" description="xxxxxx"/> 2: Class xyz ... other lines of code ...
9
3353
by: Pete Davis | last post by:
I'm using regular expressions to extract some data and some links from some web pages. I download the page and then I want to get a list of certain links. For building regular expressions, I use an app call The Regulator, which makes it pretty easy to build and test regular expressions. As a warning, I'm real weak with regular expressions. Let's say my regular expression is:
2
1927
by: teo | last post by:
match word with interpunctuation Hallo, I need to build a regular expression able to match a specified word, preceded and followed by few chars (mainly interpunctuation) Below the code. ------------------------
11
3101
by: Steve | last post by:
Hi All, I'm having a tough time converting the following regex.compile patterns into the new re.compile format. There is also a differences in the regsub.sub() vs. re.sub() Could anyone lend a hand? import regsub
1
1586
by: AAaron123 | last post by:
I found this on the Internet and tried a few of them and they worked in VS2008. Actually it was in a different form but I converted to make a smaller file. The data is the same as the original. I'm confused about how regular expressions work in different systems. I suspect that each system may have some things that do not work in other systems. So my question is: Do the things in the table below work on VS2008? And what is Posix and...
14
4981
by: Andy B | last post by:
I need to create a regular expression that will match a 5 digit number, a space and then anything up to but not including the next closing html tag. Here is an example: <startTag>55555 any text</aClosingTag> I need a Regex that will get all of the text between the html tags above (the html tags are random and i do not know them before hand). The match string always starts with at least 5 digits.
0
8597
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
9145
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
9010
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
6515
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5857
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
4356
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
1
3033
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
2319
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
1992
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.