package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(<p value="id">(?=1445).+\R.+<p value="IP">)(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})(.+)`)
var str = ` <list name="ItemList">
<item>
<p value="id">1445</p>
<p value="IP">10.25.30.19</p>
<p value="Prflen">26</p>
</item>
<list name="ItemList">
<item>
<p value="id">1499</p>
<p value="IP">10.40.50.53</p>
<p value="Prflen">26</p>
</item>
<list name="ItemList">
<item>
<p value="id">1445</p>
<p value="IP">10.45.70.19</p>
<p value="Prflen">26</p>
</item>
<list name="ItemList">
<item>
<p value="id">1446</p>
<p value="IP">10.77.90.55</p>
<p value="Prflen">26</p>
</item>`
var substitution = "\110.25.30.19\3"
fmt.Println(re.ReplaceAllString(str, substitution))
}
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 Golang, please visit: https://golang.org/pkg/regexp/