Specific Character Count in Regular Expressions

THIS IS DISTINCT FROM THE REFERENCED QUESTION because I have extensively researched and tested various solutions before resorting to posting this inquiry.

I am in need of a validation for inputs that adhere to the following criteria:

The first character is always: 0
The second character is always: 1
Followed by exactly 9 digits

For example:

case 1: 01123456789 => should match

case 2: `01123456789`0 => should not match but does match

case 3: 123`01123456789`5985 => should not match but does match

I am currently using the following pattern:

/([0][1][0-9]{9})/g

However, both case 2 and 3 are also matching with this pattern, when only case 1 should be accepted. How can I adjust the pattern to achieve this?

I am utilizing this tool to test the patterns

javascriptregex

Answer №1

Make sure to employ the correct anchoring technique (\b is recommended in this scenario for 'word boundary'):

/\b01\d{9}\b/g

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