CODEWITHSUNDEEP
javaregex
user1154644
user1154644

Reputation: 4609

Java Regex matching with parenthesis

I am trying to come up with the regex to find strings matching the following pattern:

(someNumber - someNumber) With the parenthesis included.

I tried:

"\\([1-9]*-[1-9]*\\)"

but that doesn't seem to work.

I also need to match:

The letter W or L followed by (someNumber - someNumber) With the parenthesis included.

I tried to use the same pattern above, slightly modified, but again, no luck:

"W|L \\([1-9]*-[1-9]*\\)"

Any help would be appreciated

Upvotes: 0

Views: 285

Answers (3)

BigDataLearner
BigDataLearner

Reputation: 1468

You can try this :
"(W|L)\\s*\\(\\d+-\\d+\\)"

Upvotes: 0

David Knipe
David Knipe

Reputation: 3454

Further to blueygh2's answer, your regex will fail if the numbers contain zeroes. My guess is you want to avoid leading zeroes, in which case use [1-9]\d* (or [1-9][0-9]*). If you want to allow the numbers to equal 0 but otherwise avoid leading zeroes, do ([1-9]\d*|0).

Upvotes: 0

blueygh2
blueygh2

Reputation: 1538

Include W|L in parentheses:

(W|L)

If you want to include space characters before and after the minus, add \s or a space before and after -

"((W|L)\\s)?\\([1-9]*\\s-\\s[1-9]*\\)"

If you already know that there will be at least one digit, use + instead of *, as * matches zero or more, whereas + matches 1 or more.

The pattern given above matches with and without a W or L in front. Here's a pattern that matches with and without space around the - and with or without W or L in front. Additionally, it also captures numbers containing 0, which you excluded in your original regular expression.

"((W|L)\\s)?\\(\\d+\\s?-\\s?\\d+\\)"

Upvotes: 1

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