 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Java Forum / First Aid / February 2007Need help with regular expression
Hi, I'm trying to construct a regular expression to check the occurance of two substrings in a String, but I haven't yet found something that works. Could someone please help? This is used to parse lines of HTML code. I'm using String.matches(regex) to find out if the string matches anything like this : ...<!-- %%...%% -->... The dots can be replaced with anything or even nothing. This doesn't seem to work : String.matches(".*" + "<!-- %%" + ".*" + "%% -->"+ ".*") Thanks,  SignatureLuc Van Bogaert > Hi, > [quoted text clipped - 15 lines] > > Thanks, The '.*' is used to match zero or more occurances of any character. The '*' modifier is greedy however. This means that it'll match as many times as it can. You need to match only zero to three times, which can be accomplished by '.{lower, upper}', so in your case: '.{0,3}'. -heAzk heAzk skrev: >> Hi, >> [quoted text clipped - 20 lines] > times as it can. You need to match only zero to three times, which can > be accomplished by '.{lower, upper}', so in your case: '.{0,3}'. I don't think Luc implied that there can be at most three characters between the %%-s, and I don't think that String.matches(regex) is the right method to use. It would be better to use something like static Pattern commentPtrn = Pattern.compile("<"-- %%(.*?)%% -->"); ... Matcher m; ... For each line: m = commentPtrn.matcher(line); if (m.find()) { // The pattern exists, and the string between the %%-s is m.group(1). } See class Pattern and class Matcher in java.util.regex. Lars Enderin skrev: > heAzk skrev: >>> Hi, [quoted text clipped - 28 lines] > > static Pattern commentPtrn = Pattern.compile("<"-- %%(.*?)%% -->"); Remove the extra ": The pattern should be "<-- %%(.*?)%% -->". > ... > Matcher m; [quoted text clipped - 6 lines] > > See class Pattern and class Matcher in java.util.regex. > Remove the extra ": The pattern should be "<-- %%(.*?)%% -->". > > [quoted text clipped - 8 lines] > > > > See class Pattern and class Matcher in java.util.regex. Thanks for your help. SignatureLuc Van Bogaert Lars Enderin schreef: > Lars Enderin skrev: >> heAzk skrev: [quoted text clipped - 31 lines] > > Remove the extra ": The pattern should be "<-- %%(.*?)%% -->". Almost: "<!-- %%(.*?)%% -->"; but I do not really see why you would need the parens, "<!-- %%.*?%% -->" should suffice. H. - -- Hendrik Maryns http://tcl.sfs.uni-tuebingen.de/~hendrik/ ================== http://aouw.org Ask smart questions, get good answers: http://www.catb.org/~esr/faqs/smart-questions.html Hendrik Maryns skrev: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 [quoted text clipped - 36 lines] > Almost: "<!-- %%(.*?)%% -->"; but I do not really see why you would need > the parens, "<!-- %%.*?%% -->" should suffice. The parentheses are not *necessary*, but useful if you want to know what the special comment contains. (Your signature should start with a line containing only "-- " (two dashes and a single space). This will enable news/mail clients to recognize it as a signature and, for example, remove it automatically from quoted material in replies.) Lars Enderin schreef: > Hendrik Maryns skrev: >> -----BEGIN PGP SIGNED MESSAGE----- [quoted text clipped - 41 lines] > The parentheses are not *necessary*, but useful if you want to know what > the special comment contains. /I/ know that, but I wanted to point it out to the OP. > (Your signature should start with a line containing only "-- " (two > dashes and a single space). This will enable news/mail clients to > recognize it as a signature and, for example, remove it automatically > from quoted material in replies.) (I know, it has to do with Enigmail and Thunderbird messing up PGP signed messages. There is a bug for it somewhere.) H. - -- Hendrik Maryns http://tcl.sfs.uni-tuebingen.de/~hendrik/ ================== http://aouw.org Ask smart questions, get good answers: http://www.catb.org/~esr/faqs/smart-questions.html Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
|
Reply to this Message
|
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.