Java字符串/正则表达式替换

Question

I'm quite new to regex. Not sure how to do the follow:

Replace ":p_id" with a specific value.

For example when I simply want to replace ":p_id1" with a value, it also replaced ":p_id10" with the same value which is not what I want.

It's also possible for the ":p_id"'s to have punctuation before or after them eg "=:p_id1)"

Any advice?

Answer 1

Use the \\b (word boundary) operator

myString.replaceAll(":p_id1\\b","some replacement");

See Pattern > Boundary matchers

Answer 2

You could use a negative lookahead at the end of your Pattern.

For instance:

Pattern pattern = Pattern.compile(":p_id\\d(?!\\d)");
String example = ":p_id1 :p_id10";
Matcher matcher = pattern.matcher(example);
while (matcher.find()) System.out.println(matcher.group());

Output:

:p_id1

Answer 3

Here's the pattern I made:

 ^[=]{0,1}:p_id1\b[=]{0,1}

This matches strings like:

:p_id1
=:p_id1
:p_id1=

but doesn't match (for instance):

:p_id10