An article shows you the comparison of regular expressions between Python and Java
- 2021-11-30 00:43:03
- OfStack
Catalog Simple Batch Replacement Complex Template Replacement Summary
References:
Regular expression syntax-a rookie tutorial Implementation of Java Regular Expression
Simple batch replacement
Example: Will
and
Bulk replace with
&&
Python Implementation
import re
def transformSimple(fromRegex, toText, inText):
return re.sub(fromRegex, toText,inText, flags =re.I)
if __name__ == "__main__":
inText = "x =1 and y =2"
fromRegex = " and "
toText = " && "
outText = transformSimple(fromRegex,toText,inText )
print(outText)
## OUTPUT : x =1 && y =2
Java Implementation
import java.util.*;
import java.util.regex.*;
public class RegexTest {
private static String transformSimple(String regexPattern, String replText, String inText){
return Pattern.compile(regexPattern, Pattern.CASE_INSENSITIVE).matcher(inText).replaceAll(replText);
}
public static void main(String[] args) {
String input = "x =1 and y =2";
String patternString =" and ";
String toText = " && ";
String outText ="";
outText = transformSimple(patternString, toText, input);
System.out.println("RESULT: " + outText);
}
// RESULT: x =1 && y =2
Complex template replacement
Example: Will
x in (1,2)
Bulk replace with
[1,2].contains(x)
Analysis: Templating
Input packet capture(\S+)\s+in\s*\((.+?)\)
Output grouping filling
[@2].contains(@1) – @1
And @ 2 correspond to Group 1 and Group 2 in packet capture, respectively.
Python Implementation
import re
def transformComplex(fromRegex, toText, inText):
regObj = re.compile(fromRegex, flags =re.I)
for match in regObj.finditer(inText):
index = 1
outText = toText
for group in match.groups():
outText = outText.replace("@"+str(index), group)
index +=1
inText = inText.replace(match.group(0), outText)
return inText
if __name__ == "__main__":
fromRegex = "(\S+)\s+in\s*\((.+?)\)"
toText = "[@2].contains(@1)"
inText = "x in (1,2) and y in (3,4)"
outText22 = transformComplex(fromRegex, toText, inText)
print(outText22)
## OUTPUT: [1,2].contains(x) and [3,4].contains(y)
Implementation of Java
import java.util.*;
import java.util.regex.*;
public class RegexTest {
private static String transformComplex(String regexPattern, String replText, String inText){
Pattern pattern = Pattern.compile(regexPattern, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(inText);
String outText ="";
while (matcher.find()){
outText = replText;
for (int i =1; i <= matcher.groupCount(); i++){
outText = outText.replace("@"+i, matcher.group(i));
}
inText = inText.replace(matcher.group(0), outText);
}
return inText;
}
public static void main(String[] args) {
String input = "x in (1,2) and y in (3,4)";
String patternString ="(\\S+)\\s+in\\s*\\((.+?)\\)";
String toText = "[@2].contains(@1)";
String outText ="";
outText = transformComplex(patternString, toText, input);
System.out.println("RESULT: " + outText);
}
}
// RESULT: [1,2].contains(x) and [3,4].contains(y)
Summarize
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