CODEWITHSUNDEEP
javaregexreplace
Pecana
Pecana

Reputation: 363

Replace character if not preceeded by "+"

in java i need to replace a number with a word only if it is not preceeded by the "+". Example:

- match1
- match+1

Should become:

matchone
match+1 (no modify)

I tried with

>>>name = name.replaceAll("([^+])1", "one");
matcone                                      //required "matchone"

But it is not working. Any suggestions?

Thank you

Upvotes: 0

Views: 207

Answers (2)

Erwin Bolwidt
Erwin Bolwidt

Reputation: 31299

Your regex is eating the character before the one and replacing that with "one" as well, so the output in the first instance is "matcone".

You can use a negative look-behind expression (?<!) to match any "1" that is not preceded by a "+":

name = name.replaceAll("(?<!\\+)1", "one");

Upvotes: 1

Toto
Toto

Reputation: 91518

Use a negative lookbehind:

name = name.replaceAll("(?<!\\+)1", "one");

Upvotes: 6

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