Regex,replaceAll with HashMap (Code Issue)

[schgk khan]

Hello guys,

I have the following code and i want to match the text inside the body with my hashmap key and want to replace it with hashmap value, but this code is not working and not replacing at all. I am using negative lookbehind

                                
        for(Entry<String, String> entry : paramMapping.entrySet()) {
                  log.debug("entry key : "+entry.getKey()+" entry value "+entry.getValue());
		 String out= body.replaceAll("(?<!!)"+entry.getKey(),entry.getValue());
                           }
        log.debug("output: "+out);

Thanks in advance.

[Tony Docherty]

That will look for and replace all occurrences of the hash key not preceded by '!' and replace them with the hash value - is that what you wanted to do?

[Tony Docherty]

And welcome to the Ranch.

[schgk khan]

Tony Docherty wrote:That will look for and replace all occurrences of the hash key not preceded by '!' and replace them with the hash value - is that what you wanted to do?

well i have a

String body = " this is your email #template  "

what i want to do is i am replace #template in my string to some value which is in hashmap value for Instance in the scenario i have key = "#template", value "emailTemplate" i want to replace it in string using hashmap. thanks

[Tony Docherty]

schgk khan wrote:

Tony Docherty wrote:That will look for and replace all occurrences of the hash key not preceded by '!' and replace them with the hash value - is that what you wanted to do?

well i have a

String body = " this is your email #template  "

what i want to do is i am replace #template in my string to some value which is in hashmap value for Instance in the scenario i have key = "#template", value "emailTemplate" i want to replace it in string using hashmap. thanks

OK so why not just do a straight replaceAll, ie:

        for(Entry<String, String> entry : paramMapping.entrySet()) {  
             String out= body.replaceAll(entry.getKey(), entry.getValue());  
             }  

Or if you need to make sure you only match on whole words then restrict the match to word boundaries ie:

        for(Entry<String, String> entry : paramMapping.entrySet()) {  
             String out= body.replaceAll("\\b"+entry.getKey()+"\\b", entry.getValue());  
             }  

[schgk khan]

Tony Docherty wrote:

schgk khan wrote:

Tony Docherty wrote:That will look for and replace all occurrences of the hash key not preceded by '!' and replace them with the hash value - is that what you wanted to do?

well i have a

String body = " this is your email #template  "

what i want to do is i am replace #template in my string to some value which is in hashmap value for Instance in the scenario i have key = "#template", value "emailTemplate" i want to replace it in string using hashmap. thanks

OK so why not just do a straight replaceAll, ie:

        for(Entry<String, String> entry : paramMapping.entrySet()) {  
             String out= body.replaceAll(entry.getKey(), entry.getValue());  
             }  

Or if you need to make sure you only match on whole words then restrict the match to word boundaries ie:

        for(Entry<String, String> entry : paramMapping.entrySet()) {  
             String out= body.replaceAll("\\b"+entry.getKey()+"\\b", entry.getValue());  
             }  

Yeah thanks it works . I was missing out this part

"\\b"+entry.getKey()+"\\b 

", and thank you for your welcome greetings, I love being here.

[Richard Tookey]

schgk khan wrote:

Yeah thanks it works . I was missing out this part

"\\b"+entry.getKey()+"\\b 

", and thank you for your welcome greetings, I love being here.

You should also make sure that nothing in the key is interpreted as a regex meta character by using

"\\b\\Q"+entry.getKey()+"\\E\\b"

or

"\\b"+Pattern.quote(entry.getKey())+"\\b"

[Tony Docherty]

Richard Tookey wrote:
You should also make sure that nothing in the key is interpreted as a regex meta character by using

Good point.