how do you replace a string of 4 digits with the same 4 digits,

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Anonymous
2016-06-04 04:30:50 Post No. 54901068
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Anonymous 2016-06-04 04:30:50 Post No. 54901068 [Report]

how do you replace a string of 4 digits with the same 4 digits, but padded with parentheses?

e.g. 2016 --> (2016)

i know how to find the 4 digit string, but not how to replace it

grep -E -o "[0-9]{4}"

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Anonymous 2016-06-04 04:53:12 Post No.54901300
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Anonymous 2016-06-04 04:53:12 Post No.54901300 [Report]

>>54901068
install gentoo

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Anonymous 2016-06-04 05:00:17 Post No.54901381
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Anonymous 2016-06-04 05:00:17 Post No.54901381 [Report]

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let string = format!("({})", string);

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Anonymous 2016-06-04 05:14:29 Post No.54901524
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Anonymous 2016-06-04 05:14:29 Post No.54901524 [Report]

to pad with strings "foo" and "bar"

sed -E 's/([0-9]{4})/foo\1bar/g'

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Desu (ID: !bOTNET/Ylo) 2016-06-04 07:19:06 Post No.54902759
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Desu (ID: !bOTNET/Ylo) 2016-06-04 07:19:06 Post No.54902759 [Report]

>>54901068

export TMP=1234
echo "($TMP)"

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Anonymous 2016-06-04 07:23:29 Post No.54902797
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Anonymous 2016-06-04 07:23:29 Post No.54902797 [Report]

>>54901068

(define (wrap str)
   (string-append "(" str ")"))