Extract a substring between two words from a string
Question
I have the following string:
string = "asflkjsdhlkjsdhglk<body>Iwant\to+extr@ctth!sstr|ng<body>sdgdfsghsghsgh"
I would like to extract the string between the two <body> tags. The result I am looking for is:
substring = "<body>Iwant\to+extr@ctth!sstr|ng<body>"
Note that the substring between the two <body> tags can contain letters, numbers, punctuation and special characters.
Is there an easy way of doing this? Thank you!
4 answers
solution1
7 2013-11-26 18:08:39
这是正则表达式方式：
regmatches(string, regexpr('<body>.+<body>', string))
solution2
6 2013-11-26 18:16:10
regex = '<body>.+?<body>'
You want the non-greedy ( .+? ), so that it doesn't group as many <body> tags as possible.
If you're solely using a regex with no auxiliary functions, you're going to need a capturing group to extract what is required, ie:
regex = '(<body>.+?<body>)'
solution3
2 2013-11-26 18:05:44
strsplit() should help you:
>string = "asflkjsdhlkjsdhglk<body>Iwant\to+extr@ctth!sstr|ng<body>sdgdfsghsghsgh"
>x = strsplit(string, '<body>', fixed = FALSE, perl = FALSE, useBytes = FALSE)
[[1]]
[1] "asflkjsdhlkjsdhglk" "Iwant\to+extr@ctth!sstr|ng" "sdgdfsghsghsgh"
> x[[1]][2]
[1] "Iwant\to+extr@ctth!sstr|ng"
Of course, this gives you all three parts of the string and does not include the tag.
solution4
0 2017-08-27 07:00:19
I believe that Matthew's and Steve's answers are both acceptable. Here is another solution:
string = "asflkjsdhlkjsdhglk<body>Iwant\\to+extr@ctth!sstr|ng<body>sdgdfsghsghsgh" regmatches(string, regexpr('<body>.+<body>', string)) output = sub(".*(<body>.+<body>).*", "\\\\1", string) print (output)
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