java compiler errors on regexs

[kramer31]

Hi.

I have an array of strings that I'm trying to use in regexs. the
following line is generating Several errors:

BrowserIdentification.java:17: illegal escape character
protected static String[] acceptedUserAgentPatterns = {"MSIE\s?(\d)+
\.", "Firefox/(\d)\."};


It looks like it is complaining about the \d (which I read about in
the java regex documentation) as well as the \. (which I have to
escape so that it only matches a literal '.', right?

BTW, I am using the ( ) so that I can use matcher.group, later. I'm
compiling using 1.4.2 specifically jrockit-R27.1.0-jdk1.4.2_12

Am I just missing something really obvious here?

 

[Arne Vajhøj]

I have an array of strings that I'm trying to use in regexs. the
following line is generating Several errors:

BrowserIdentification.java:17: illegal escape character
protected static String[] acceptedUserAgentPatterns = {"MSIE\s?(\d)+
\.", "Firefox/(\d)\."};


It looks like it is complaining about the \d (which I read about in
the java regex documentation) as well as the \. (which I have to
escape so that it only matches a literal '.', right?

BTW, I am using the ( ) so that I can use matcher.group, later. I'm
compiling using 1.4.2 specifically jrockit-R27.1.0-jdk1.4.2_12

Am I just missing something really obvious here?

\ is also escape in Java strings, so you need to double them
from \ to \\.

Arne

 

[Knute Johnson]

Hi.

I have an array of strings that I'm trying to use in regexs. the
following line is generating Several errors:

BrowserIdentification.java:17: illegal escape character
protected static String[] acceptedUserAgentPatterns = {"MSIE\s?(\d)+
\.", "Firefox/(\d)\."};


It looks like it is complaining about the \d (which I read about in
the java regex documentation) as well as the \. (which I have to
escape so that it only matches a literal '.', right?

BTW, I am using the ( ) so that I can use matcher.group, later. I'm
compiling using 1.4.2 specifically jrockit-R27.1.0-jdk1.4.2_12

Am I just missing something really obvious here?

Yes but don't feel bad we all had this problem at one point.

You need to use two backslashes in Java because of the way the string is
interpreted. So to match a group of numbers use \\d+ or the literal .
use \\.

Get yourself a modern compiler, even JRockit has a newer version.

 

[Roedy Green]

protected static String[] acceptedUserAgentPatterns = {"MSIE\s?(\d)+
\.", "Firefox/(\d)\."};

the problem is \ is a magic character both to Java string literals and
to Regex. see
http://mindprod.com/jgloss/regex.html#QUOTING

 

[kramer31]

Thanks for the help.

BTW I have many newer versions of Java, but this pertains to an old
legacy app.

Hi.

I have an array of strings that I'm trying to use in regexs. the
following line is generating Several errors:

BrowserIdentification.java:17: illegal escape character
protected static String[] acceptedUserAgentPatterns = {"MSIE\s?(\d)+
\.", "Firefox/(\d)\."};

It looks like it is complaining about the \d (which I read about in
the java regex documentation) as well as the \. (which I have to
escape so that it only matches a literal '.', right?

BTW, I am using the ( ) so that I can use matcher.group, later. I'm
compiling using 1.4.2 specifically jrockit-R27.1.0-jdk1.4.2_12

Am I just missing something really obvious here?

Yes but don't feel bad we all had this problem at one point.

You need to use two backslashes in Java because of the way the string is
interpreted. So to match a group of numbers use \\d+ or the literal .
use \\.

Get yourself a modern compiler, even JRockit has a newer version.