How can I test if a RegEx matches a string exactly?
var r = /a/;
r.test("a"); // returns true
r.test("ba"); // returns true
testExact(r, "ba"); // should return false
testExact(r, "a"); // should return true
This question is related to
javascript
regex
Here's what is (IMO) by far the best solution in one line, per modern javascript standards:
const str1 = 'abc';
const str2 = 'abc';
return (str1 === str2); // true
const str1 = 'abcd';
const str2 = 'abc';
return (str1 === str2); // false
const str1 = 'abc';
const str2 = 'abcd';
return (str1 === str2); // false
Write your regex differently:
var r = /^a$/;
r.test('a'); // true
r.test('ba'); // false
var data = {"values": [
{"name":0,"value":0.12791263050161572},
{"name":1,"value":0.13158780927382124}
]};
//JSON to string conversion
var a = JSON.stringify(data);
// replace all name with "x"- global matching
var t = a.replace(/name/g,"x");
// replace exactly the value rather than all values
var d = t.replace(/"value"/g, '"y"');
// String to JSON conversion
var data = JSON.parse(d);
Write your regex differently:
var r = /^a$/;
r.test('a'); // true
r.test('ba'); // false
Here's what is (IMO) by far the best solution in one line, per modern javascript standards:
const str1 = 'abc';
const str2 = 'abc';
return (str1 === str2); // true
const str1 = 'abcd';
const str2 = 'abc';
return (str1 === str2); // false
const str1 = 'abc';
const str2 = 'abcd';
return (str1 === str2); // false
If you do not use any placeholders (as the "exactly" seems to imply), how about string comparison instead?
If you do use placeholders, ^
and $
match the beginning and the end of a string, respectively.
var data = {"values": [
{"name":0,"value":0.12791263050161572},
{"name":1,"value":0.13158780927382124}
]};
//JSON to string conversion
var a = JSON.stringify(data);
// replace all name with "x"- global matching
var t = a.replace(/name/g,"x");
// replace exactly the value rather than all values
var d = t.replace(/"value"/g, '"y"');
// String to JSON conversion
var data = JSON.parse(d);
If you do not use any placeholders (as the "exactly" seems to imply), how about string comparison instead?
If you do use placeholders, ^
and $
match the beginning and the end of a string, respectively.
If you do not use any placeholders (as the "exactly" seems to imply), how about string comparison instead?
If you do use placeholders, ^
and $
match the beginning and the end of a string, respectively.
Source: Stackoverflow.com