MATLAB: Please can you give me some regular expression help

MATLABregular expressionsstrings

Hi,

I'm trying to extract a number from a string. The string is of the form H970D80Dia4W19L19WT856 and I want to extract the number after the 'D', in this case 80. But regular expressions are confusing me, I can get this far

regexp(file.name,'[D]\d+','match')

Which gives 'D80', but I can't get rid of the 'D'. Can you help me with this? The strings may be different lengths and can have a different number of characters to the left and right of what I want to extract.

Also is there a good cheat sheet I can print for future reference?

Best Answer

regexp('H970D80Dia4W19L19WT856','(?<=D)\d+','match')

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MATLAB: Remove parentheses with regexp

a ='0.00 (578)';
regexp(a,'(?<=\()[\d.]+(?=\))','match')

MATLAB: How to extract strings with varied length by regular expression

>> regexp('2018_a_myid_the_here','(?<=^\d+_[a-z]_)[a-z]+','match')
ans = 
    'myid'
>> regexp('2018_b_yourid_t_here','(?<=^\d+_[a-z]_)[a-z]+','match')
ans = 
    'yourid'

For developing and experimenting with regular expressions you might like to download my Interactive Regular Expression tool:

https://www.mathworks.com/matlabcentral/fileexchange/48930-interactive-regular-expression-tool

Best Answer

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