sed find line and replace a spacific character in the last 7 characters

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP


sed find line and replace a spacific character in the last 7 characters



I would like to replace a space character in the last seven characters of a line
that starts with the following pattern: "start-string"


"start-string"



Example of the file content :


randomdata 33243as4a4S3342as3A4S3A3s13aw38q363s4 sd7asd312vff74 41g5rfg45f5d3q

start-string 4d d5f5d4fd4f5g6r fgdf dhfhdgnmasj 32121fdfdf21g 45s6g76t2 20



I need to replace the last space character of the line that starts with "start-string" and leave the other line as it is with no edit in the file.


"start-string"



Another question - how can I combine more than one regex command in sed?





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