22 lines
857 B
Text
22 lines
857 B
Text
----------------- Table 4.1 -----------------
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--- grep and egrep Regular Expressions ---
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(decreasing order of precedence)
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c any non-special character c matches itself
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\c turn off any special meaning of character c
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^ beginning of line
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$ end of line
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. any single character
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[...] any one of characters in ...; ranges like a-z are legal
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[^...] any single character not in ...; ranges are legal
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\n what the n'th \(...\) matched (grep only)
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r* zero or more occurrences of r
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r+ one or more occurrences of r (egrep only)
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r? zero or one occurrences of r (egrep only)
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r1 r2 r1 followed by r2
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r1|r2 r1 or r2 (egrep only)
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\(r\) tagged regular expression r (grep only); can be nested
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(r) regular expression r (egrep only); can be nested
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No regular expression matches a newline.
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