使用正则表达式python提取字符串

Question

I have text in a file that I am pushing into a string.

txt = "PRIMARY INDEX its_mnth_content_aggr ( AC_ID ,ROW_ADDED_DT ,NOTE_SEQ_NR ,BIZ_UNIT_CD ,
DISPATCH_ID ,CASE_CREATE_DT ) 
ABDCGFWERRUU 
asdffggb 
PRIMARY INDEX its_mnth_content_aggr ( AC_CASE ,ROW_ADDED_DT ,NOTE_SEQ_NR ,BIZ_UNIT_CD ,\
DISPATCH_ID ,CASE_CREATE_DT )"

I want to extract the complete primary index from it as in primary index (....)

so far i have below

x3 = re.findall(r"\bPRIMARY\sINDEX\s\w+\W.*", txt)

that gives me

['PRIMARY INDEX its_mnth_content_aggr ( AC_CASE_ID ,ROW_ADDED_DT ,NOTE_SEQ_NR ,BIZ_UNIT_CD ,DISPATCH_ID ,CASE_CREATE_DT )  ABDCGFWERRUU  qwerrtyyuiu PRIMARY INDEX its_mnth_content_aggr ( AC_CASE_ID ,ROW_ADDED_DT ,NOTE_SEQ_NR ,BIZ_UNIT_CD ,DISPATCH_ID ,CASE_CREATE_DT )']

I want something like this

['PRIMARY INDEX its_mnth_content_aggr ( AC_CASE_ID ,ROW_ADDED_DT ,NOTE_SEQ_NR ,BIZ_UNIT_CD ,DISPATCH_ID ,CASE_CREATE_DT ) PRIMARY INDEX its_mnth_content_aggr ( AC_CASE_ID ,ROW_ADDED_DT ,NOTE_SEQ_NR ,BIZ_UNIT_CD ,DISPATCH_ID ,CASE_CREATE_DT )'] 

can someone please help

Answer 1

You regex says that you want a string that starts by PRIMARY INDEX followed by any characters. So it matches all your string;

---

You have to be more specific.

PRIMARY INDEX[A-Za-z(_,\n\\ ]*\)

• the string should start with: PRIMARY INDEX
• then there could be any letter or special characters in [A-Za-z(_,\\n\\\\ ] , followed by * because we don't know the number of these characters.
• and it ends by a )

You can try it here

Answer 2

You can use

re.findall(r'\bPRIMARY\s+INDEX\s+\w+\s*\([^()]*\)', txt)

See the regex demo

Details

• \\b - word boundary
• PRIMARY\\s+INDEX - PRIMARY , 1+ whitespaces, INDEX
• \\s+ - 1+ whitespaces
• \\w+ - 1+ word chars
• \\s* - 0+ whitespaces
• \\( - a ( char
• [^()]* - 0+ chars other than ( and )
• \\) - a ) char.