regex101: PCRE (Legacy) Match Workspace

Explanation

Pro

Negative Lookbehind(?<![a-zA-Z])

Character Class[a-zA-Z]

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

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

Character Class[\-\s\(,\n=]?

?matches at most one character from the set below:

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\sany whitespace character

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\na line-feed (newline) character (ASCII 10)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 1([0-9?\.?]+\-?)

Character Class[0-9?\.?]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

\-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

\s?optionally matches any whitespace character

Group 2(amps|volts|watts|volt|amp|watt|a|v|w){1}

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

1st Alternativeamps

ampsthe literal text amps (case insensitive)

2nd Alternativevolts

voltsthe literal text volts (case insensitive)

3rd Alternativewatts

wattsthe literal text watts (case insensitive)

4th Alternativevolt

voltthe literal text volt (case insensitive)

5th Alternativeamp

ampthe literal text amp (case insensitive)

6th Alternativewatt

wattthe literal text watt (case insensitive)

7th Alternativea

athe literal a (97₁₀ / 141₈ / 61₁₆) (case insensitive)

8th Alternativev

vthe literal v (118₁₀ / 166₈ / 76₁₆) (case insensitive)

9th Alternativew

wthe literal w (119₁₀ / 167₈ / 77₁₆) (case insensitive)

Negative Lookahead(?![a-zA-Z]+)

Character Class[a-zA-Z]+

+matches at least one character from the set below:

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

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

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Quick Reference

25 tokens

Regular Expression

(?<![a-zA-Z])[\-\s\(,\n=]?([0-9?\.?]+\-?)\s?(amps|volts|watts|volt|amp|watt|a|v|w){1}(?![a-zA-Z]+)

New

It shouldn't match:

ESQ45A
JW795A
SO15A
SQ18W
SQQ10W
AK10V

It should match:
XYZ 5 amps
1 V
1123 w
5 Volt
1234 amp

Extraction

It shouldn't match:

ESQ45A
JW795A
SO15A
SQ18W
SQQ10W
AK10V

It should match:
XYZ 5 amps
1 V
1123 w
5 Volt
1234 amp