Perl regular expression in script not working as intended

[pietzcker]

I think you want

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/(?<==)\w+(?=;|,)/

as your JavaScript regex object, so the line should be

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var findResult = selectedText.match(/(?<==)\w+(?=;|,)/);

[wchu01]

I have replaced with the following statement however it does not seems to work.

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var findResult = selectedText.match(/(?<==)\w+(?=;|,)/);

I apologies for not providing the text which I am working on earlier. I am trying to use the regex to extract those strings between the start marker of "=" and end marker of either "," or ";".

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C133   C                   1=UNNAMED_1_CON18_I1_A,
                              2=EARTH;
C133   C                   1=EARTH,
                              2=UNNAMED_1_CER_I28_A;
C177   C                   1=UNNAMED_2_CON18_I6_A,
                              2=EARTH;
U13   ACT138            1=UNNAMED_2_87C54C_I42,
                              2=UNNAMED_2_87C54C_I43,
                              3=UNNAMED_2_87C54C_I44,
                              4=_GND,
                              5=_GND,
                              6=UNNAMED_2_ACT138_I84,
                              8=_GND,
                              9=UNNAMED_1_DIGBLK_I47,
                              12=UNNAMED_1_DIGBLK_I46,
                              16=5V_VCC;

[pietzcker]

Oops. Big mistake on my part.

JavaScript does not support lookbehind; I forgot about that entirely.

So your alternative is to use

var findResult = selectedText.match(/=(\w+)(?=;|,)/);

and use findResult[1] as your match. I don't know JavaScript, you'd probably have to feed the selection to it line by line, or you will only get the first match.

[wchu01]

I understand that Javascript does not support lookbehind however the Perl Regex Engine within allows entry of Perl Expression that do lookbehind.

[Mofi]

The JavaScript core contains a regular expression object using the same syntax as the Perl regular expression engine. But the JavaScript core does not contain the entire, full featured perl regular expression engine. Don't mix that. The Javascript regular expression object using Perl syntax is not the Perl regular expression engine.