I want to replace + sign with 2 blackslash and 1 + sign (\\+)...
when I use the replaceAll()...
It throws a 500 status error like
"java.util.regex.PatternSyntaxException: Dangling meta character '+' near index 0"
wht s the solution or how can I replace ????
8  3028 
I want to replace + sign with 2 blackslash and 1 + sign (\\+)...
when I use the replaceAll()...
It throws a 500 status error like
"java.util.regex.PatternSyntaxException: Dangling meta character '+' near index 0"
wht s the solution or how can I replace ????
Bit of a nasty one that - replaceAll("\\+", "\\\\\\\\+")
Bit of a nasty one that
- replaceAll("\\+", "\\\\\\\\+")
How does it work can you explain?
Debasis Jana
How does it work can you explain?
Debasis Jana
Remember that + is a special character and \ is a special-special character.
To match one \ you need four \
I'm not a big fan of regex (They're why I run screaming from PERL, but then isn't that known as a "write once" language because you don't ever want to read your own code?).
Anyhowdy, if you are just replacing text, there is no need to use String's replaceAll method which drags regex patterns into the fray. Use String's replace method which simply replaces all occurrences of the first string with the second. - result = s.replace("+", "\\\\+");
(You still need to escape \ as you always do in any string, of course.) String.replace API
I'm not a big fan of regex (They're why I run screaming from PERL, but then isn't that known as a "write once" language because you don't ever want to read your own code?).
Anyhowdy, if you are just replacing text, there is no need to use String's replaceAll method which drags regex patterns into the fray. Use String's replace method which simply replaces all occurrences of the first string with the second.
- result = s.replace("+", "\\\\+");
(You still need to escape \ as you always do in any string, of course.)
String.replace API
Why do all mathematicians seem to have some sort of history with Perl ...
Why do all mathematicians seem to have some sort of history with Perl ...
Maybe it's being relegated to linux/UNIX machines where it's more likely you'll bump into it. That's what happened to me.
Maybe it's being relegated to linux/UNIX machines where it's more likely you'll bump into it. That's what happened to me.
Until now I managed to stay as far away as possible from Larry Wall's miscarriage.
I only trust that Perl as far as i can throw a rock at it.
kind regards,
Jos
Until now I managed to stay as far away as possible from Larry Wall's miscarriage.
I only trust that Perl as far as i can throw a rock at it.
kind regards,
Jos
I'm scared to look at the Perl forum to see what they're writing about us!
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