const regex = /^(-|\+)??(180(\.0+?)??|(1[0-7]|\d)\d??(\.\d+?)??)$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(-|\\+)??(180(\\.0+?)??|(1[0-7]|\\d)\\d??(\\.\\d+?)??)$', 'gm')
const str = `// Valid longitude values
180
180.000
179
179.0
179.999
100
100.00
100.9
99
99.99
99.0
80
10
10.00
10.99
8
8.9
8.0
1
1.0
1.9
0
0.1
0.9
+180
+180.000
+179
+179.0
+179.999
+100
+100.00
+100.9
+99
+99.99
+99.0
+80
+10
+10.00
+10.99
+8
+8.9
+8.0
+1
+1.0
+1.9
+0
+0.1
+0.9
-180
-180.000
-179
-179.0
-179.999
-100
-100.00
-100.9
-99
-99.99
-99.0
-80
-10
-10.00
-10.99
-8
-8.9
-8.0
-1
-1.0
-1.9
-0
-0.1
-0.9
// Invalid longitude values
181
180.00001
180.1
180.9
-181
-180.00001
-180.1
-180.9
+181
+180.00001
+180.1
+180.9`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions