Java String Manipulation Conditional replaceAll

Question

I am reading in Strings from a file like...an example would be:

I JUMP UP HIGH IN THE AIR WITH SOUP TO GET TO YOU.

How would I do a conditional replaceAll, e.g. replace all P at end of word unless the word ends with UP.

This what I tried based on the example for U at the end of the word:

s = s.replaceAll("(!UP\\b)P\\b", "PS")

The above I would expect to change the string s to:

I JUMPS UP HIGH IN THE AIR WITH SOUP TO GET TO YOU.

This is a follow up question to the one found at... stackoverflow.com/questions/35835596/… — Hedgebox
– Hedgebox, Commented Mar 19, 2016 at 23:12

Sergey Kalinichenko · Accepted Answer · 2016-03-19 23:16:18Z

0

Your expression is pretty close: all you need is to check that the prior character is not a U, rather than UP, because P is already being matched:

(?<!U)P\b

This matches a single character P at the word boundary, unless it is preceded by a U character.

Demo.

answered Mar 19, 2016 at 23:16

Sergey Kalinichenko

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4 Comments

Hedgebox Over a year ago

What if I don't want to change if it ends with OUP?

Sergey Kalinichenko Over a year ago

@Hedgebox Then you use (?<!OU) - i.e. P unless preceded by OU.

Hedgebox Over a year ago

Tks. Is there a good tutorial on string manipulation with examples you can point me to?

Sergey Kalinichenko Over a year ago

@Hedgebox I keep this tutorial handy - it discusses regular expressions in great details.

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