Specific Regex/Regex Condition

Question

I'm having trouble grabbing a specific piece of text.

My input is:

PMT(B1+B144+B145*1/12.0,B148+B149*1*12.0,B1)

I want to grab all the B1's, but when I'm trying to do that I'm getting B1, B144, B148, B1. My first solution was to check the following character. So I came up with the regex B1[\W]. There are two problems with this: One it ends up grabbing the non word character, and two it doesn't work with "=B1".

How can I grab specific B1s? For this example I want the first and last B1.

Edit: I'm using the Java String function replaceAll

My eyes hurt. Anyways, what language/flavor are you using ?

HamZa
– HamZa

2013-07-15 13:22:23 +00:00
Commented Jul 15, 2013 at 13:22 — HamZa
– HamZa, Commented Jul 15, 2013 at 13:22
I'm using java String function replaceAll

Taztingo
– Taztingo

2013-07-15 13:25:13 +00:00
Commented Jul 15, 2013 at 13:25 — Taztingo
– Taztingo, Commented Jul 15, 2013 at 13:25

HamZa · Accepted Answer · 2013-07-15 13:26:59Z

2

Use B1(?!\\d) which means:

B1 : match B1
(?!\\d) : not followed by a digit

answered Jul 15, 2013 at 13:26

HamZa

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anubhava · Accepted Answer · 2013-07-15 13:26:52Z

2

Make sure you use word boundaries:

String repl = str.replaceAll("\\bB1\\b", "");

answered Jul 15, 2013 at 13:26

anubhava

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