CODEWITHSUNDEEP
regextextsed
physicophilic
physicophilic

Reputation: 251

Removing space on one side of dollar sign using sed

I want to convert

Some text $ latex code  $ some more text

to

Some text $latex code$ some more text

using sed (or something else) with reasonable efficiency.

I tried to remove the first space using

sed -e 's/\$\s*/\$/g'

but that makes $ some to $some which is undesirable. Likewise I can do it for the second $, but that will also create similar issue at the front.

I then tried capturing group like this:

sed -e 's/\$\s*\(.*\)\s*\$/\$\1\$/g'

which is not working (maybe because (.*) group includes \s and $?). Its output is

Some text $latex code  $ some more text

So how can I do this efficiently? It would be great if the answer can also accommodate $$'s spanning two lines.

Upvotes: 1

Views: 125

Answers (1)

Cyrus
Cyrus

Reputation: 88654

With GNU sed:

sed 's/\$ \+/$/; s/ \+\$/$/2' file

or with \s (matches space and tab):

sed 's/\$\s\+/$/; s/\s\+\$/$/2' file

Output:

Some text $latex code$ some more text

\+: means that the preceding expression must match at least one time or multiple times

$: dollar sign, no special meaning here

2: only replace the 2nd match of the regex

Upvotes: 2

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