Using Regex to Match Pattern

Question

I am trying to use regex to retrieve Title:Code pair.

(.*?\(CPT-.*?\)|.*?\(ICD-.*?\))

Data:

SENSORINEURAL HEARING LOSS BILATERAL (MILD) (ICD-389.18) RIGHT WRIST GANGLION CYST (ICD-727.41) S/P INJECTION OF DEPO MEDROL INTO LEFT SHOULDER JOINT (CPT-20600)

I would like to capture:

SENSORINEURAL HEARING LOSS BILATERAL (MILD) (ICD-389.18)
RIGHT WRIST GANGLION CYST (ICD-727.41)
S/P INJECTION OF DEPO MEDROL INTO LEFT SHOULDER JOINT (CPT-20600)

What is the proper regex to use?

Your capture example #1 and #2 both include RIGHT WRIST, is this intentional? — jmstoker
– jmstoker, Commented Nov 14, 2013 at 18:46
@jmstoker: No, i don't think, since the "hearing loss" is "bilateral" and not located on the "right wrist" — Casimir et Hippolyte
– Casimir et Hippolyte, Commented Nov 14, 2013 at 18:55
@jmstoker I agree with Casimir. See ICD-389.18 and ICD-727.41 — p.s.w.g
– p.s.w.g, Commented Nov 14, 2013 at 18:57
Fair enough, I'm not familiar with ICD codes, but looking at it further your comments make sense. — jmstoker
– jmstoker, Commented Nov 14, 2013 at 18:58

p.s.w.g · Accepted Answer · 2013-11-14 19:05:47Z

4

What about a pattern like this:

.*?\((CPT|ICD)-[A-Z0-9.]+\)

This will match zero or more of any character, non-greedily, followed by a ( followed by either CPT or ICD, followed by a hyphen, followed by one or more Uppercase Latin letters, decimal digits or periods, followed by a ).

Note that I picked [A-Z0-9.]+ because, to my understanding, all current ICD-9 codes , ICD-10 codes, and CPT codes conform to that pattern.

The C# code might look a bit like this:

var result = Regex.Matches(input, @".*?\((CPT|ICD)-[A-Z0-9.]+\)")
                  .Cast<Match>()
                  .Select(m => m.Value);

If you want to avoid having any surrounding whitespace, you simply trim the result strings (m => m.Value.Trim()), or ensure that the matched prefix starts with a non-whitespace character by putting a \S in front, like this:

var result = Regex.Matches(input, @"\S.*?\((CPT|ICD)-[A-Z0-9.]+\)")
                  .Cast<Match>()
                  .Select(m => m.Value);

Or using a negative lookahead if you need to handle inputs like (ICD-100)(ICD-200):

var result = Regex.Matches(input, @"(?!\s).*?\((CPT|ICD)-[A-Z0-9.]+\)")
                  .Cast<Match>()
                  .Select(m => m.Value);

You can see a working demonstration here.

edited Nov 14, 2013 at 19:05

answered Nov 14, 2013 at 18:44

p.s.w.g

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3 Comments

jmstoker Over a year ago

Your regex places a space in front of the 2nd and 3rd match. The space can be moved to the end by adding a [ ]* (space) to the end of your pattern. .*?\((CPT|ICD)-[A-Z0-9.]+\)[ ]*

p.s.w.g Over a year ago

@jmstoker That's a good point. But in case OP doesn't want to capture the surrounding whitespace at all, he'd need something a little different. I've provided a few alternatives.

user557597 Over a year ago

+1 - I think its a toss-up between runaway errant text and flexibility. Erant text will not return partial result, flexibility might return too much ie: \(ICD-[^)]*\)

Casimir et Hippolyte · Accepted Answer · 2013-11-14 18:49:32Z

1

You can use the split() method:

string input = "SENSORINEURAL HEARING LOSS BILATERAL (MILD) (ICD-389.18) RIGHT WRIST GANGLION CYST (ICD-727.41) S/P INJECTION OF DEPO MEDROL INTO LEFT SHOULDER JOINT (CPT-20600)";
string pattern = @"(?<=\))\s*(?=[^\s(])";
string[] result = Regex.Split(input, pattern);

answered Nov 14, 2013 at 18:49

Casimir et Hippolyte

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Comments

gpmurthy · Accepted Answer · 2013-11-14 18:51:52Z

0

Consider the following Regex...

.*?\d\)

Good Luck!

answered Nov 14, 2013 at 18:51

gpmurthy

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