Check whether the whole string matches Java regular Expression using pattern

Question

My logic is to find whether the file contains specific version text. For example the file may contain

act 1.9
ACT 1.4
MA 1.2
ma 1.9
...

I want to return true if my file contain any of the above text. Meaning the text to be searched in case Insensitive and the version may be anything from 0.0 to 9.0

So i wrote the regular expression as below:

    final Map<String, Float> outdatedPatterns = new HashMap<String, Float>();
    outdatedPatterns.put("act\\s*_*([0-9.]+)", Float.parseFloat("5.4"));
    outdatedPatterns.put("ma\\s*_*([0-9.]+)", Float.parseFloat("5.3"));

    for (Map.Entry entry : outdatedPatterns.entrySet()) {
        String regex = (String) entry.getKey();
        Float minSupportedVersion = (Float) entry.getValue();
        Pattern outdatedPattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
        Matcher outdatedPatternMatcher = outdatedPattern.matcher(content);
        while (outdatedPatternMatcher.find()) {
            /* stuff  */

Problem with this logic is, the logic considers following texts also true

schema 1.4
react 3.0

But all i wanted is to search the whole string act and ma only.
Kindly suggest how to change my regular expression to solve the issue

Add a `\b` (boundary) to the front of the regex (e.g. `"\\bact\\s*_*([0-9.]+)"`) — Tibrogargan, Oct 13 '16 at 07:37
"\bact\s*_*([0-9.]+)" - yes this seems to be working. Thank you — Akshe, Oct 13 '16 at 07:39
also ... `Float.valueOf(5.4)` is cheaper than `Float.parseFloat("5.4")` — Tibrogargan, Oct 13 '16 at 07:41
Look at this [link](http://stackoverflow.com/questions/12574853/regex-to-find-whole-words) — Karthik, Oct 13 '16 at 08:41
@tibrigaran Thanks for the info. The version i am getting from some other csv file as string. so i mentioned it as string in my example — Akshe, Oct 13 '16 at 09:57

Check whether the whole string matches Java regular Expression using pattern

0 Answers0