Replace a word only if it's not preceded by a certain character(s)
I like to replace all occurrences of a string in JavaScript where the strin开发者_StackOverflowg does not start with < or /. I was able to match the word but I want to replace the word only, not the preceding characters.
var hitName1 = "body";
var testHtmlStr = "This is a test string with <body> html tag and with regular body string and another <body> html string and with no flexbody and with /body as in a url string";
var re5 = new RegExp('[^<\/]' + hitName1 , 'gi');
console.log(re5);
var testResult5 = testHtmlStr.match(re5);
console.log(testResult5);
I get the result [" body", "xbody"]
If I use replace() instead of match() I will replace " body" and "xbody" with replace string. But I would like to replace only "body" with replace string. How to do that?
More explanation:
use of replace:
var testResult5 = testHtmlStr.replace(re5, "HELLO");
console.log(testResult5);
The resulting string after replacement:
"This is a test string with <body> html tag and with regularHELLO string and another <body> html string and with no fleHELLO and with /body as in a url string"
The replace function replaced body with HELLO, but I want to replace body (with nospace infront). Also the xbody replaced with HELLO, but I want to replace only body not xbody.
Hope this is more clear.
One way you could do it is defining a capturing group around the preceding character:
var hitName1='body';
var testHtmlStr = "This is a test string with <body> html tag and with regular body string and another <body> html string and with no flexbody and with /body as in a url string";
var re5 = new RegExp('([^<\/]|^)' + hitName1, 'gi');
alert(testHtmlStr.replace(re5, '$1'));
jsFiddle Demo
So if you want to replace your string with fos for example, you can write $1fos.
UPDATE: Following @yankee's comment I've changed the regex: added |^ to make it work when testHtmlStr starts with hitName1 or is equal to it.
well i couldn't understand what you want to do exactly but i think you are trying to replace some tags from a string that contains tags and other textNodes
However, i think if you use "for" loop to verify which tags should be replace and which tags shouldn't, you will be able to do what you need.
for(result in testResult5)
{
if(result!="body") {// do what you want}
}
加载中,请稍侯......
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