Perl regular expression in script not working as intended

pietzcker · Oct 01, 2009#162009-10-01T14:52+00:00

I think you want

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

as your JavaScript regex object, so the line should be

Code: Select all

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

wchu01 · Oct 01, 2009#172009-10-01T15:13+00:00

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

Code: Select all

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 ";".

Code: Select all

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 · Oct 02, 2009#182009-10-02T10:53+00:00

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 · Oct 02, 2009#192009-10-02T11:27+00:00

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

Mofi · Oct 02, 2009#202009-10-02T12:50+00:00

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.

Perl regular expression in script not working as intended

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