I am trying to parse out the following using Regexes in Java.
My Test String consists of strings within "${}" like for ex: "Test ${template} in ${xyz} : ${abc}"
I am trying to use the regex of the form (\$\{[^\}]+\}) to match it. The current regex does not match anything in the test string.
If I add (.*?)(\$\{[^\}]+\})(.*?) to make it ungreedy, it is really not consistent in giving me whatever I want to match.
What is the issue with my regex? How do I fix it?
Most of the time when someone asks regular expression questions I ask them to at least consider Commons Lang StringUtils:
String[] names = substringsBetween(theString, "${", "}");
public static void main(String[] args) throws Exception {
String test = "Test ${template} in ${xyz} : ${abc}";
Matcher m = Pattern.compile("\\$\\{[^\\}]+\\}").matcher(test);
while (m.find())
System.out.println(m.group());
}
Outputs:
${template}
${xyz}
${abc}
You might have to escape the braces as well:
jcomeau@intrepid:/usr/src/clusterFix$ python
Python 2.6.7 (r267:88850, Jun 13 2011, 22:03:32)
[GCC 4.6.1 20110608 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> s = 'Test ${template} in ${xyz} : ${abc}'
>>> re.compile('\$\{[^}]+\}').findall(s)
['${template}', '${xyz}', '${abc}']
String test = "Test ${template} in ${xyz} : ${abc}";
Pattern p = Pattern.compile("\\$\\{[^}]+\\}");
Matcher matcher = p.matcher(test);
while (matcher.find()) {
System.out.println(matcher.group());
}
String ip="Test ${template} in ${xyz}";
Pattern p = Pattern.compile("\\{.*?\\}");
Matcher m =p.matcher(ip);
while(m.find())
{
System.out.println(m.group());
}
One slash isn't enough. You need two slashes.
Try this regex:
\\$\\{.+\\}
It checks for strings with ${ and } surrounding text. This filters out blank strings (${}) and anything which isn't closed properly.
If you want to check for text infront and behind, try .+\\$\\{.+\\}.+
