13. Apparatus for software processing, comprising: a processor, which is configured to accept quality information comprising names of elements of software code and respective quality indications regarding tested acceptability of the elements, to process the names so as to extract a list of substrings that occur in the names, and to assign respective metrics to the substrings responsively to the quality indications of the elements in whose names the substrings occur; and an output device, which is coupled to present at least some of the substrings to a user in accordance with the assigned metrics, wherein the processor is configured to determine a number of the elements in whose names a given substring occurs and which are indicated by the quality indications as being acceptable, and to compute a metric of the given substring based on the number, and wherein the processor is further configured to determine another number of the elements in whose names the given substring occurs and which are indicated by the quality indications as unacceptable, and to compute the metric of the given substring based on the number and on the other number.
13. Apparatus for software processing, comprising: a processor, which is configured to accept quality information comprising names of elements of software code and respective quality indications regarding tested acceptability of the elements, to process the names so as to extract a list of substrings that occur in the names, and to assign respective metrics to the substrings responsively to the quality indications of the elements in whose names the substrings occur; and an output device, which is coupled to present at least some of the substrings to a user in accordance with the assigned metrics, wherein the processor is configured to determine a number of the elements in whose names a given substring occurs and which are indicated by the quality indications as being acceptable, and to compute a metric of the given substring based on the number, and wherein the processor is further configured to determine another number of the elements in whose names the given substring occurs and which are indicated by the quality indications as unacceptable, and to compute the metric of the given substring based on the number and on the other number. 17. The apparatus according to claim 13 , wherein the processor is configured to determine the number by accumulating occurrences of the given substring in the elements in a hash table.