"XXXXX"
(X+)[A-Z]+
(X+?)[A-Z]+
Regular Expression | |||
String | |||
Group 0 | |||
Group 1 | Group 2 | Group 3 | Group 4 |
Lazy (reluctant) quantifiers are useful if you are using regular expressions to search a text for a pattern. For example, say that you are editing a text with a text editor that supports regular expression searches. (Many text editors do so, although they often support only basic regular expressions.) You wish to check that every beginning quote mark " is matched by a closing quote mark. So you search for this pattern:
".*"
Recall that the outer two quote marks in the above are delimiters and not part of the actual RE. The actual RE without delimiters is ".*"
Unfortunately, this will match any substring that starts with a " and ends with a " no matter what is inside. This is not what you want. If the line of text is
"balanced" quote marks have two " marks
the expression matches the substring
"balanced" quote marks have two "
since the greedy quantifier .*
matches as much as it can, including the inner quote mark.
Fix the regular expression so that only "balanced" is matched.