CODEWITHSUNDEEP
regex
Neelima
Neelima

Reputation: 13

Regular expression for positive numbers from 1-99 up to 2 decimal places

I am trying to write a regular expression for accepting positive numbers from 1-99 and accepting decimals up to 2 places I have written this expression 

([1-9]|[1-9][0-9])(.[0-9]{1,2})?

But when I tested the expression, it accepted 100 and decimals up to 3 places, while I wanted decimals only up to 2 places and 100 should not be accepted.

Upvotes: 1

Views: 5172

Answers (4)

ghoti
ghoti

Reputation: 46826

This seems to work for me:

/^[1-9][0-9]?(\.[0-9]{1,2})?$/

As David said, you need to escape your ., or it matches any character, including a digit.

Upvotes: 3

Pierluc SS
Pierluc SS

Reputation: 3176

I would go with this ^(?:\d[1-9]|[1-9]|[1-9][0-9])(?:\.(?:[0-9][1-9]|[1-9]))?$

0 FAIL
0.0 FAIL
0.00 FAIL
0.1 FAIL
0.12 FAIL
1 PASS
12 PASS
135 FAIL
1.00 FAIL?
01.35 PASS
10.35 PASS
12.01 PASS
12.1 PASS
12.23 PASS
12.234 FAIL

EDIT ANSWER AFTER FIRST COMMENT.

Upvotes: -1

Mike Mackintosh
Mike Mackintosh

Reputation: 14237

This will match 1-99 and up to 2 decimal places.

((0?[1-9]|[1-9][0-9])\.[0-9]{1,2})

Upvotes: -1

David M
David M

Reputation: 72850

Escape the . which matches any character as \.. You have no delimiters around this, so note that this would match, for example, 91.23 in the string 191.234.

([1-9]|[1-9][0-9])(\.[0-9]{1,2})?

Upvotes: 3

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