搜索带有JavaScript点的字符串

Question

When I try to seach for a string with a point (ie '1.' ), js also points to substrings with commas instead of points. It's better to look at the example:

'1,'.search('1.');        // 0
'xxx1,xxx'.search('1.');  // 3
// Normal behaviour
'1.'.search('1,');        // -1

Does anyone know why JavaScript behave itself so? Is there a way to search for exactly passed string?

Answer 1

Per the docs :

The search() method executes a search for a match between a regular expression and this String object.

. has a special meaning in Regular Expressions. You need to escape the . before matching it. Try the following:

 console.log('xxx1,xxx'.search('1\\\\.')); 

Answer 2

Use indexOf() .

 let str = "abc1,231.4"; console.log(str.indexOf("1.")); 

Answer 3

indexOf() method should work fine in this case

'1,'.indexOf('1.');  

The above code should return -1

Answer 4

String.search is taking regex as parameter.

Regex evaluate . by any character ; you gotta escape it using double anti-slash \\\\ .

 console.log('1,'.search('1\\\\.')); console.log('xxx1,xxx'.search('1\\\\.')); console.log('xxx1.xxx'.search('1\\\\.')); console.log('1.'.search('1,'));