string.replaceFirst(String,String) not working

hi,

i was using string.replaceFirst(String,String) but it didnt work in my company where i am working.

what might be the problem

Without you posting the exact String you want to replace, I can only assume the somehow fall into a Regular expression and it's inappropriate. I suggest you look at java.util.regex.Pattern to determine the correct pattern to use to find what needs replaced.

Satyajit Bhadange wrote:hi,

i was using string.replaceFirst(String,String) but it didnt work in my company where i am working.

what might be the problem

Since I have no trouble with the method I assume you have a bug in your code. Note - Strings are immutable so the original string is not modified and the method returns a new String. If this is not the problem then I bet you have a fault in your regular expression.

Of course, it would be easier for the forum members to diagnose the problem if you posted your code.

i was calling replace.First() method because i wanted to replace each occurrence of String to be replace and recorded

method call was as below

sQuery = sQuery .replaceFirst("$"+svalue,"SOME NAME");

when i talk to my team members about this they told me that it is machine problem because they face same problem before..

is it really a machine problem or or it just a wrong coding..??

Satyajit Bhadange wrote:i was calling replace.First() method because i wanted to replace each occurrence of String to be replace and recorded

method call was as below

sQuery = sQuery .replaceFirst("$"+svalue,"SOME NAME");

when i talk to my team members about this they told me that it is machine problem because they face same problem before..

is it really a machine problem or or it just a wrong coding..??

The $ character is a meta character and has special meaning in regular expressions (it means the end of input). You need to escape it.

sQuery = sQuery .replaceFirst("\\$"+svalue,"SOME NAME");

You should really escape the whole of the regex and the replacement in this case just in case svalue or the replacement contain other meta characters. i.e.

sQuery = sQuery .replaceFirst(Pattern.quote("$"+svalue),Matcher.quoteReplacement("SOME NAME"));

Satyajit Bhadange wrote:
when i talk to my team members about this they told me that it is machine problem because they face same problem before..

is it really a machine problem or or it just a wrong coding..??

So... your colleagues couldn't get it to work. And blamed the hardware?

It's a regex issue -- as someone will likely beat me to the explanation...

Henry

Thank you so much..

satisfy with your answer...but is still need to try it..

Thank you...

Thank you...

it worked.....

Please take this opportunity to laugh and point at your co-workers.