Match the substring in a string and append the substring with #tags

Question

I have a string in that match the substring and append the substring with #tag like #Test#;

String str = 'This is a TesT for reteSt the tEsTing which will confirm that test was not TEsTed perfectly by teSTer';

String str2 = 'test';

return 'This is a #TesT# for re#teSt# the #tEsT#ing which will confirm that #test# was not #TEsT#ed perfectly by #teST#er';

i have tried in many ways iam unable to achieve output; please help

String myString1 = 'This is a TesT for reteSt the tEsTing which will confirm that test was not TEsTed perfectly by teSTer';

String myString2 = 'test';

string replacement='#test#';

string result = myString1.replaceAll('(?i)'+myString2,replacement);
system.debug(result);

iam getting result but it is case insensitive.

thanks for any help.

Answer 1

This is much easier and less code to implement by means of regex.

You did a good attempt. A couple of minor changes are required.

Take a look at the working online example https://regex101.com/r/FBhTZp/1 it also contains an explanation to it.

(?i)(test) - any part of the expression to the right of (?i) is a case insensitive.

#$0# - $0 matches the found group. In this regex, we have only one group.

String input = 'This is a TesT for reteSt the tEsTing which will confirm that test was not TEsTed perfectly by teSTer';
String regexToFind = '(?i)(test)';
String regexToReplace = '#$0#';

String output = input.replaceAll(regexToFind, regexToReplace);
System.debug('output: ' + output);

result is:

DEBUG|output: This is a #TesT# for re#teSt# the #tEsT#ing which will confirm that #test# was not #TEsT#ed perfectly by #teST#er

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