Question

i want to match a known number(floating point or integer) with a string and finding number of that repeat.

like match 22 in “22.5 98 12 22 322”

how i can do it with regular expression ?

Answer 1

str.match(/substr/g).length

returns number of occurrences of “substr” in “str”. For example:

str = "22.5 98 12 22 322"
num = str.match(/22/g).length
alert(num) // 3

If you want to match integers rather than just substrings, make sure the number is preceded and followed by a space:

str = "22.5 98 12 22 322"
num = str.match(/(^|\s)22($|\s)/g).length
alert(num) // 1

Another option, without regular expressions:

str = "22.5 98 12 22 322"
num = str.split(" ").filter(function(item) {
    return Number(item) === 22;
}).length;