How do I form a regular expression to extract variables from a string which are of the format ${variable name}
Lets say I have a string like this :
hello ${ person } welcome to ${ university name}. you are enrolled in ${class}
and I need to extract these from the string
person ,
university name ,
class
You can use this regex to grab all the values inside ${...}:
\$\{ *([\w -]+) *\}
Java code:
Pattern p = Pattern.compile("\\$\\{ *([\\w -]+) *\\}");
Use a Matcher object to grab all the groups using while(matcher.find()) {...} code snippet.
while(matcher.find()) { System.out.println(matcher.group(1)); }You also can use RegEx that'll find all values in ${}
\b*\u0024\{([\w\s]*)\}\B
where u0024 is a $ in unicode and test in regexplanet
Here is an example of code:
Pattern pattern = Pattern.compile("\\b*\u0024\\{([\\w\\s]*)\\}\\B");
String data = ...//String to parse
Matcher matcher = pattern.matcher(data);
// check all occurrence
while (matcher.find()) {
...
}
You can use this
MessageFormat.format(str, list);
where the str=hello {1} welcome to {2}. you are enrolled in {3}
and the just pass the values in the list
