Get substrings from string using regular expression

Question

I am trying to get sub-strings from a large one using RegEx. The sub-strings' format is as following:

Starts with number 00-99 followed by an equals sign =.
May contain at least one character. Any character.
Ends with underscore '_'.

Example sub-strings:

01=#010.0000#001.0000#+10.0#AA_
02=#020.0000#002.0000#+20.0#BB_

Example full string:

01=#010.0000#001.0000#+10.0#AA_02=#020.0000#002.0000#+20.0#BB_

I tried this expression but it gets me the full string as a result.

^\d{2}=.+_$

I'm missing something. Any help?

If you want parts of a string then you first need to drop the anchors ^ and $ as that will always match the entire string or will not match at all. — juharr
– juharr, Commented Nov 30, 2018 at 13:45

Wiktor Stribiżew · Accepted Answer · 2018-11-30 13:44:29Z

3

You may use

\d{2}=.*?_(?=\d{2}=|$)

See the regex demo

You may also require no digits before the match with a (?<!\d) negative lookbehind:

(?<!\d)\d{2}=.*?_(?=\d{2}=|$)

The \d{2}=.*?_(?=\d{2}=|$) pattern matches 2 digits, =, and then any 0+ chars other than line break chars, as few as possible, up to the first _ that has two digits and = after it or is at the end of the string.

answered Nov 30, 2018 at 13:44

Wiktor Stribiżew

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1 Comment

Wiktor Stribiżew Over a year ago

Note that you may probably want to make your pattern more verbose if there are more specific requirements. See \d{2}=(?:#[-+]?\d+\.\d+(?:_[-+]?\d+\.\d+)*)+_[a-zA-Z]{2}_ demo.

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