Regular Expressions 101

Explanation

Pro

^start of line

Group 1([A-Za-z ]+\b(?<!PRESENT\b)(?<!ABSENT\b)(?<!NORMAL\b)(?<!POSITIVE\b)(?<!NEGATIVE\b)(?<!TRACE\b))

Character Class[A-Za-z ]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

the literal (32₁₀ / 40₈ / 20₁₆)

\ba Unicode word boundary

Negative Lookbehind(?<!PRESENT\b)

PRESENTthe literal text PRESENT (case sensitive)

\ba Unicode word boundary

Negative Lookbehind(?<!ABSENT\b)

ABSENTthe literal text ABSENT (case sensitive)

\ba Unicode word boundary

Negative Lookbehind(?<!NORMAL\b)

NORMALthe literal text NORMAL (case sensitive)

\ba Unicode word boundary

Negative Lookbehind(?<!POSITIVE\b)

POSITIVEthe literal text POSITIVE (case sensitive)

\ba Unicode word boundary

Negative Lookbehind(?<!NEGATIVE\b)

NEGATIVEthe literal text NEGATIVE (case sensitive)

\ba Unicode word boundary

Negative Lookbehind(?<!TRACE\b)

TRACEthe literal text TRACE (case sensitive)

\ba Unicode word boundary

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

Group 2(ABSENT|PRESENT|NORMAL|TRACE|POSITIVE|NEGATIVE|\"[A-Z]+)+

+repeats the group contents below at least once:

1st AlternativeABSENT

ABSENTthe literal text ABSENT (case sensitive)

2nd AlternativePRESENT

PRESENTthe literal text PRESENT (case sensitive)

3rd AlternativeNORMAL

NORMALthe literal text NORMAL (case sensitive)

4th AlternativeTRACE

TRACEthe literal text TRACE (case sensitive)

5th AlternativePOSITIVE

POSITIVEthe literal text POSITIVE (case sensitive)

6th AlternativeNEGATIVE

NEGATIVEthe literal text NEGATIVE (case sensitive)

7th Alternative\"[A-Z]+

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Character Class[A-Z]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group 3([\(\+\) ]*)

Character Class[\(\+\) ]*

*matches any number of characters from the set below:

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group 4(Absent|Normal|Present|Trace|Positive|Negative)*

*repeats the group contents below any number of times:

1st AlternativeAbsent

Absentthe literal text Absent (case sensitive)

2nd AlternativeNormal

Normalthe literal text Normal (case sensitive)

3rd AlternativePresent

Presentthe literal text Present (case sensitive)

4th AlternativeTrace

Tracethe literal text Trace (case sensitive)

5th AlternativePositive

Positivethe literal text Positive (case sensitive)

6th AlternativeNegative

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Unit Test Summary

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Quick Reference

25 tokens

Regular Expression

^([A-Za-z ]+\b(?<!PRESENT\b)(?<!ABSENT\b)(?<!NORMAL\b)(?<!POSITIVE\b)(?<!NEGATIVE\b)(?<!TRACE\b)) +(ABSENT|PRESENT|NORMAL|TRACE|POSITIVE|NEGATIVE|\"[A-Z]+)+ *([\(\+\) ]*) *(Absent|Normal|Present|Trace|Positive|Negative)*

Unit Tests

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