Regular Expressions 101

Pro

^start of line

Group 1(((&&|<=|>=|<|>|!=|==|&|!)|([-+=]{1,2})|([.!?)}{;,(-]))|(else|if|float|int)|(\d[\d.]))

1st Alternative((&&|<=|>=|<|>|!=|==|&|!)|([-+=]{1,2})|([.!?)}{;,(-]))

Group 2((&&|<=|>=|<|>|!=|==|&|!)|([-+=]{1,2})|([.!?)}{;,(-]))

1st Alternative(&&|<=|>=|<|>|!=|==|&|!)

Group 3(&&|<=|>=|<|>|!=|==|&|!)

1st Alternative&&

&&the literal text &&

2nd Alternative<=

<=the literal text <=

3rd Alternative>=

>=the literal text >=

4th Alternative<

<the literal < (60₁₀ / 74₈ / 3C₁₆)

5th Alternative>

>the literal > (62₁₀ / 76₈ / 3E₁₆)

6th Alternative!=

!=the literal text !=

7th Alternative==

==the literal text ==

8th Alternative&

&the literal & (38₁₀ / 46₈ / 26₁₆)

9th Alternative!

!the literal ! (33₁₀ / 41₈ / 21₁₆)

2nd Alternative([-+=]{1,2})

Group 4([-+=]{1,2})

Character Class[-+=]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

3rd Alternative([.!?)}{;,(-])

Group 5([.!?)}{;,(-])

Character Class[.!?)}{;,(-]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative(else|if|float|int)

Group 6(else|if|float|int)

1st Alternativeelse

elsethe literal text else (case sensitive)

2nd Alternativeif

ifthe literal text if (case sensitive)

3rd Alternativefloat

floatthe literal text float (case sensitive)

4th Alternativeint

3rd Alternative(\d[\d.])

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

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25 tokens

Regular Expression

^(((&&|<=|>=|<|>|!=|==|&|!)|([-+=]{1,2})|([.!?)}{;,(-]))|(else|if|float|int)|(\d[\d.]))

Unit Tests

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