CODEWITHSUNDEEP
javaregex
Luigi Plinge
Luigi Plinge

Reputation: 51109

Returning overlapping regular expressions

Is there a regular expression that will capture all instances of an expression, regardless of whether or not they overlap?

E.g. in /abc/def/ghi if I want to capture all strings beginning with /. The regex (/.*) only returns the entire string, but I'd want it to match on /def/ghi and /ghi as well.

Upvotes: 9

Views: 1148

Answers (1)

Bart Kiers
Bart Kiers

Reputation: 170158

Sure, match an empty string and place a look-ahead after it that captures /.* in a capturing group:

Matcher m = Pattern.compile("(?=(/.*))").matcher("/abc/def/ghi");
while(m.find()) {
  System.out.println(m.group(1));
}

would print:

/abc/def/ghi
/def/ghi
/ghi

Upvotes: 11

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