How can I use preg_match to find fixed letters with a variable number?
For example:
#^[1-9][0-9]*$#
This code aims to match two numbers at the beginning of any string, such as 1 and 0.
I want to match strings in a file that follow a pattern like r00, r01, r02, r03... up to r999
I attempted the following:
#r^[1-9][0-9]*$#
*This is using Preg_Match function
However, this approach did not work. Any suggestions or assistance would be appreciated?
Utilize this specific pattern:
#^r\d{2,3}$#
For more information, check out the detailed explanation.
^ symbolizes the "beginning of a line", but within brackets, it signifies "everything except the specified characters".
For your requirement, consider using #r\d{2,3}#, possibly with a preceding ^, or following $ (excluding the hashes).
Consider using this pattern if you need to stop at r999:
#^r[0-9]{2,3}$#
This specific pattern will identify:
^)r$)You could also opt for this alternative pattern if there is no fixed upper limit— allowing r999999 as valid:
#^r[0-9]{2,}$#
What this second pattern will match:
^)r$)Here's what I think:
\br\d{1,3}\b
This regular expression will find patterns like r0, r00, r01, r02, r03... up to r999 but it won't match anything like r\d{4,}
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