pattern = new RegExp('([0-9]+([.][0-9]{1,2})?|[.][0-9]{1,2})');
it should accept 00.00, 0.0, 00.25, 00.36, 00.56,, 222.25, 222.25, 2222.25,
should not accept 000.25, 0000.25
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4Should it accept 00222.25?thb– thb2019-03-16 13:45:03 +00:00Commented Mar 16, 2019 at 13:45
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Should it accept 02.25?rishat– rishat2019-03-16 13:54:07 +00:00Commented Mar 16, 2019 at 13:54
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It's funny how regex questions on Stack Overflow precipitate a contest—a race—to see who can cook up a matching regex the fastest. Most of these questions are probably duplicates in one way or another, but we race anyway, because it's fun.thb– thb2019-03-16 14:06:12 +00:00Commented Mar 16, 2019 at 14:06
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4 Answers
If your value can not start with a zero, you could use an alternation:
^(?:(?:0{1,2}|[1-9]\d*)?\.\d{1,2}|[1-9]\d*)$
That will match:
^Start of the string(?:Non capturing group(?:Non capturing group- `0{1,2}|[1-9]\d* Match a zero 1-2 times OR digit 1-9 and 0+ times a digit
)?Close on capturing group and make it optional\.\d{1,2}Match a dot and 1-2 digits|Or[1-9]\d*Match digit 1-9 followed by 0+ times a digit
)Close non capturing group$End of the string
If you do want to allow a leading zero, you could add matching 0+ times a zero 0* before the second alternation:
^(?:(?:0{1,2}|0*[1-9]\d*)?\.\d{1,2}|[1-9]\d*)$
9 Comments
The fourth bird
@MithunS So you mean like this? regex101.com/r/2DlnTA/3 or like this regex101.com/r/2DlnTA/4
The fourth bird
@MithunS You could make the first part optional in that case regex101.com/r/2DlnTA/5
Mithun S
Where u have learnt these things? where can i learn this complex thing?
Mithun S
but one issue is i am not able to set this pattern in Angular Reactive Form Control :(
The fourth bird
These are for example 2 great sites rexegg.com and regular-expressions.info
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You can use this
^(?:(?!0{3,}).*)\.\d+$
^- Start of string.(?:(?!0{3,}).*)-Condition to avoid more than2zeros at start.\.\d+- Matches.followed by one or more digit.$- End of string
Comments
Try this:
(?<![0-9.])((?:[0-9]{1,2}|[1-9][0-9]*)(?:[.][0-9]{1,2})?)(?![0-9.])
Note the anchors (?<!) and (?!). You can omit the anchors if you wish but the anchors will let your pattern match even if the line contains noise other than the number. The (?<!X) insists that X not precede the match. The (?!X) insists that X not follow the match.
[If you wanted to insist that X did indeed precede and/or follow, then you would instead anchor with (?<=X) and/or (?=X).]
Based on the tenor of your examples, my solution assumes that these are acceptable: 01.23; 00.23; 1.23. It assumes that these are not acceptable: 011.23; 1.234.
Use this:
^([0-9][1-9]+|0{0,2})\.[0-9]+$
Explanation:
Before the dot \., It accepts either of the two (|):
^[0-9]the code starts with any number between 0 and 9[1-9]+then, there are as many digits between 1 and 9 as you wants
or:
^0{0,2}the code starts with at most two zeros
