Is there a function in jQuery or JavaScript that does the same as strstr() in PHP?
I have an AJAX response that should be 1,2,3,12,13,23 or 123. I want to check if 1 exists, then if 2 exists then if 3 exists.
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1Does your response signify an array?Robert– Robert2011-08-10 17:34:23 +00:00Commented Aug 10, 2011 at 17:34
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no, just a simple stringmedk– medk2011-08-10 17:37:46 +00:00Commented Aug 10, 2011 at 17:37
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1Are you trying to count the number of occurences for each value, or just ensure that the string contains each value?Robert– Robert2011-08-10 17:44:02 +00:00Commented Aug 10, 2011 at 17:44
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just to check whether it exists or notmedk– medk2011-08-10 17:53:11 +00:00Commented Aug 10, 2011 at 17:53
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6 Answers
Try using this:
function strstr(haystack, needle, bool) {
// Finds first occurrence of a string within another
//
// version: 1103.1210
// discuss at: http://phpjs.org/functions/strstr // + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + bugfixed by: Onno Marsman
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// * example 1: strstr(‘Kevin van Zonneveld’, ‘van’);
// * returns 1: ‘van Zonneveld’ // * example 2: strstr(‘Kevin van Zonneveld’, ‘van’, true);
// * returns 2: ‘Kevin ‘
// * example 3: strstr(‘[email protected]’, ‘@’);
// * returns 3: ‘@example.com’
// * example 4: strstr(‘[email protected]’, ‘@’, true); // * returns 4: ‘name’
var pos = 0;
haystack += "";
pos = haystack.indexOf(needle); if (pos == -1) {
return false;
} else {
if (bool) {
return haystack.substr(0, pos);
} else {
return haystack.slice(pos);
}
}
}
(From http://phpjs.org/functions/strstr:551)
Overall phpjs is pretty phenomenal.
3 Comments
medk
sorry but does this return true/false or the rest of the string after the pattern (as in the comment in the script)
Andrew Lee
It behaves exactly like the PHP strstr; i.e. returns false is substring not found, the rest of the string after the pattern if it is found, or the part of the string before if the optional parameter
bool is true.
19h
function strstr(a,c,d){var b=0,a=a+"",b=a.indexOf(c);return-1==b?!1:d?a.substr(0,b):a.slice(b)}; if you want a short version.
Ok I just found something that works!
http://my-sliit.blogspot.com/2008/06/search-string-javascript-like-strstr-in.html
Thanks for your contributions :)
1 Comment
igr
Summary:
if (someString.search(/someRegularExpression/) != -1){ // Match } Read about these javascript functions - indexOF() and lastIndexOf().
Comments
Well, not built in. String.indexOf( String str ) returns the integer index of the substring
but then, you can easily build one: http://aimtb.wordpress.com/2011/03/16/strstr-in-javascript/
function strstr(haystack, needle, bool) {
// Finds first occurrence of a string within another
//
// version: 1103.1210
// discuss at: http://phpjs.org/functions/strstr // + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + bugfixed by: Onno Marsman
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// * example 1: strstr(‘Kevin van Zonneveld’, ‘van’);
// * returns 1: ‘van Zonneveld’ // * example 2: strstr(‘Kevin van Zonneveld’, ‘van’, true);
// * returns 2: ‘Kevin ‘
// * example 3: strstr(‘[email protected]’, ‘@’);
// * returns 3: ‘@example.com’
// * example 4: strstr(‘[email protected]’, ‘@’, true); // * returns 4: ‘name’
var pos = 0;
haystack += "";
pos = haystack.indexOf(needle); if (pos == -1) {
return false;
} else {
if (bool) {
return haystack.substr(0, pos);
} else {
return haystack.slice(pos);
}
}
}
Comments
Here is an implementation without any library/method calls:
function strstr (haystack, needle) {
var i = 0,
tempLength = 0,
temp = [];
for (;;) {
if (haystack[i] === undefined || needle == null) {
return "No match";
}
//if the char doesn't match then reset
else if (haystack[i] !== needle[tempLength]) {
temp = [];
tempLength = 0;
}
//the char matches so let's store it.
else if (haystack[i] === needle[tempLength]) {
temp[tempLength] = haystack[i];
if (needle[tempLength + 1] === undefined) {
return temp;
}
tempLength++;
}
i++;
}
};
Comments
const isSame = function(indx, haystack, needle){
let j = 0;
for(let i=indx, len = indx + needle.length; i< len; i++) {
if (haystack[i] !== needle[j++]){
return false;
}
}
return true;
}
var strStr = function(haystack, needle) {
if (!needle) {
return 0;
}
for(let i=0; i<haystack.length; i++) {
if (haystack[i] === needle[0]){
if(isSame(i, haystack, needle)){
return i;
};
}
}
return -1;
};
console.log(strStr("hello", "ll"));
console.log(strStr("mississippi", "issip"));Base conditions:- when needle is empty string, it will return 0. If there is no match found it will return -1.
Comments
