Regular Expressions 101

Explanation

Pro

^start of line

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Group 1((none|dotted|dashed|solid|double|groove|ridge|(?:in|out)set|hidden|inherit|initial|revert|unset){1}([ \t]+(none|dotted|dashed|solid|double|groove|ridge|(?:in|out)set|hidden|inherit|initial|revert|unset)){0,3})

Group 2(none|dotted|dashed|solid|double|groove|ridge|(?:in|out)set|hidden|inherit|initial|revert|unset){1}

{1}repeats the group contents below exactly 1 time:

1st Alternativenone

nonethe literal text none (case sensitive)

2nd Alternativedotted

dottedthe literal text dotted (case sensitive)

3rd Alternativedashed

dashedthe literal text dashed (case sensitive)

4th Alternativesolid

solidthe literal text solid (case sensitive)

5th Alternativedouble

doublethe literal text double (case sensitive)

6th Alternativegroove

groovethe literal text groove (case sensitive)

7th Alternativeridge

ridgethe literal text ridge (case sensitive)

8th Alternative(?:in|out)set

Non-Capturing Group(?:in|out)

1st Alternativein

inthe literal text in (case sensitive)

2nd Alternativeout

outthe literal text out (case sensitive)

setthe literal text set (case sensitive)

9th Alternativehidden

hiddenthe literal text hidden (case sensitive)

10th Alternativeinherit

inheritthe literal text inherit (case sensitive)

11th Alternativeinitial

initialthe literal text initial (case sensitive)

12th Alternativerevert

revertthe literal text revert (case sensitive)

13th Alternativeunset

unsetthe literal text unset (case sensitive)

Group 3([ \t]+(none|dotted|dashed|solid|double|groove|ridge|(?:in|out)set|hidden|inherit|initial|revert|unset)){0,3}

{0,3}repeats the group contents below between 0 and 3 times:

Character Class[ \t]+

+matches at least one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Group 4(none|dotted|dashed|solid|double|groove|ridge|(?:in|out)set|hidden|inherit|initial|revert|unset)

1st Alternativenone

nonethe literal text none (case sensitive)

2nd Alternativedotted

dottedthe literal text dotted (case sensitive)

3rd Alternativedashed

dashedthe literal text dashed (case sensitive)

4th Alternativesolid

5th Alternativedouble

6th Alternativegroove

7th Alternativeridge

8th Alternative(?:in|out)set

9th Alternativehidden

10th Alternativeinherit

11th Alternativeinitial

12th Alternativerevert

13th Alternativeunset

Character Class[\t ]*

$end of line

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

26 tokens

Regular Expression

^[ \t]*((none|dotted|dashed|solid|double|groove|ridge|(?:in|out)set|hidden|inherit|initial|revert|unset){1}([ \t]+(none|dotted|dashed|solid|double|groove|ridge|(?:in|out)set|hidden|inherit|initial|revert|unset)){0,3})[\t ]*$

Unit Tests

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